close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2412198

код для вставки
Dec. 10, 1946.
'
w. M.. BACON v
2,412,198
TELEGRAPH swITcHING SYSTEM
Filed Sept. 24, 1945
10 Sheets-Sheet 1_
Dec. 10, 1946.
W. M.- BACON ,
2,412,198
TELEGRIAPH SWITCHING SYSTEM
Filèd Sepp. 24, 1945
10 Sheets-Shee’rl 2
ML.FutY
.@QstYmE
OìsQklOu
6.1 kkx
1
/NVENTOR
W M BACÓN
nur#
A 7` TORNE Y
De¢.1o,1`946.
`
W_M_BA¢ON
TELEGRAPH
SWITCHING
l
SYSTEM
.
'
Filed sept. 24, 1945
2,412,193
4
1o sheets-sheet 3
'G
C
RE
ÑEPR
ATTORNEY _
Dec. 10, 1946.
» w, M_ BACON
I
2,412,198
TELEGRAPH i SWITCHING SYSTEM
Filed Sept, 24v, 1943-
.
10 Sheets-Sheet 4>
i.
no
„o o
RE‘CYL
no.;
/NvE/VTQR
n’. M BACON
A TTORNEV
Dec. 1o, 1946.
`
¿,w. M, BACON
'
2,412,198
'I‘ELEGRAPH SWITGHING SYSTEM
Filed Sept. 24, 1945
lO Sheets-Sheet 5
» /NVE/v TOR
W M. BA CON
ATTORNEY
Dec. 1G, 1946.
2,412,198
« w. M. BACON
‘ 'Í‘ELEGRAPH SWITCHIÑG SYSTEM'
Fiîed sept. -24, 1943
10 Sheets-Sheet 6 ' '
`| |L______
_MNH».-.
|._r.|
_ _ _ Qïm
_ _
0 .I\>< >
»No
MhnRK.h F_ |
#MJfi„LpI_lünj#êNi.¿uV1m__ßEÈw/îl-âr@j
-W
rlmâ/m2h _
e,
_ __
_ _
mM?.
@yN/JÈmÉv_
ww_
1ì|@_im
mïi»,
:um
1_
we
_EN. al _.
W
_m
RM.
..W W
MW
Hunw
Deç. 10, 1946.
' 2,412,198
W. M. BACON
TELEGRAPH SWITCHING SYSTEM
~ Filed sept. 24, 1945
. lorsheets-sheet 7
'
8F/G.
/NVENTOR
W M BACON
Arron/ver
Dec. 1o_,'~1946.
l
W, M, BACON
l
2,412,198 '
A T‘ELEGRAPH' SWITCHING SYSTEM
Filed sept. 24„ A1943
1o sheèrs-sheet e
„
<FIG'.A
.9
/N VEN TOR
c „w M. 5,4 co/v
By 'fd/ß@ JW.
ATTORNEY
Dec. 1o, 1946..
w.' M. BACON
2,412,198
TELEGRAPH SWITCHING SYSTEM
Filed Sept. 24, 1945
.Q.El
„W5/v 7'0/5
WBACON
sry@ 'z i f
_
.
ATTORNEY
Dec. 10, 1946.
` y2,412,198
w. M. BACON
TELEGRAPH SWITCHING SYSTEM
lO Sheets-Sheet lO
Filed Sept. 24, 1945
$SK5.3SEQ.“
/NVENTOR
W M. BACON
@y
ATTQQNEY
2,412,198
Patented Dec. 10, 1946
UNITED >STATES PATENT OFFICE
TELEGRAPH sWITCHïING SYSTEM
Walter M. Bacon, New York, N. Y.,hassignor to
Bell Telephone Laboratories, Incorporated,
New York, N. Y., a corporation of New York
. Application September 24, 1943, Serial No. 503,599
18 Claims.
l
This invention relates to communication sys
tems and more particularly Ito automatic tele
graph switching systems in which storage con
trolled transmitting apparatus at outlying tele
graph stations is automatically set into operation
for transmitting stored messages from the outly
ing stations to the central switching station un
der control of equipment at the central switching
station.
The object of the present invention is to pro
vide an improved telegraph system with increased
flexibility in the manner of controllingY transmis
sion from a plurality of outlying transmitters to
a central switching station.
In accordance with an exemplary embodi
ment of the invention, the system disclosed in
United States patent application, Branson et al..
Serial No. 448,878, ñled June 27, 1942, has been
improved to increase the ilexibility of lthe control
arrangementA for initiating the transmission> of
messages from the outlying stations to the cen
tral switching station.
In accordance with the system disclosed in the
said Branson application, means are provided to
enable the operator or attendant at the central
switching station to manually at willr start the
transmission of any transmitter associated with
any of thev lines extending from the central
switching station,'provided. that line is not en
(Cl. 178-3) ,
2
are tested in the same order during each cycle
of operation and the same number of times, un
less a manual operablekey individual to each
transmitter has been operatedv or released.
In accordance with the present invention,
means are provided for automatically changing
the order and frequency of testing of the various
transmitters in cyclic order without requiring the
necessity of changing solder connections, without
10 manually operating any key individual to each
of the transmitters andrwithout requiring an in
dividual code combination or group of code com
binations for each turn or Itest of a transmitter
during a cycle of operation. In other Words, a
15 feature of the present invention relates to pro
vision of an automatic skip circuit which may be
arrangedy to cause the transmitter start or control
equipment to automatically'skipany one 0r more
of the transmitters associated with any line dur
20 ing any cycle operation of the transmitter start
circuit.
Thus, in accordance with the present inven
tion, means are provided for automatically vary
ing the frequency and/or order of testing the
25 various transmitters associated with any of the
party- lines, thus enabling the trafûc from theV
various stations. to be handled most expeditiously
and, enabling the system toHbe operated at its
highest eiiiciency.
A feature' of theV present invention relates to
gaged in the transmission of a message from 30
apparatus for incorporating the above apparatus
some transmitter to the central switching station.
Means are also provided to interrupt transmis
sion from any transmitter toward the central
switching station and thereafter initiate trans
mission from any other transmitter. In that ap
and features embodyingv the _present invention
in the system disclosed in said> Branson' applica
tion without interfering` with or eliminating any
, of the features of the. system described in said
above-identified copending Branson application.
The foregoing objects and «features of the pres
ically testing these transmitters for storage ma
ent- invention, the novel features of which are
terial available for transmission to the central
specifically set forth in the-claims appended here
switching station and initiating transmission
from transmitters which are provided with such 40 to, and> maybe more readily'understoo'd‘from the
following description when read with reference
material in rotation one at a time.
In the system disclosed in said` Branson appli
to the attached drawings, in which:
cation means are also provided for Itesting and
Fig. lA shows the manner in which Figs, 2,>
initiating transmission from certain of the trans
3f and’ ‘ishould-be arranged adjacent one"y another
mitters more often .than from others of the trans
to show in outline form various cir-cuits and
mitters. This means, however, requires extensive
equipment of an exemplary system in accordance
wiring changes. and at times the utilization of an
with the present invention as Well as to illustrate
individual code for each turn given to any trans
the' routesï'ofî messages through the system;
mitter in the complete cycle ofv testing all of the
transmitters. In addition in said application 50,' Fig. l-B shows the manner in which- Figs. 5
through> 1'1„ inclusiva, should be arrangedA adja
manual means are provided for preventing the
cent
one. another to- showfth'e circuit arrange
testing and initiation of transmission of any oneY
ments in detail in. exemplary form ofthe inven
or more of the transmitters.
tion;
~
In accordance With this previous application,V
the system is arranged so that >the transmitters 55; Figs. 2, 3 and 4 when arranged >asf shown in Fig.
plication, means are also disclosed for automat
4.
3
1A show in outline form a typical system em
As shown in Fig. 2, three separate and distinct
bodying the present invention; and
Figs. 5 through 11, inclusive, when arranged as
sets of switching and controlling circuits, some-_k y
times referred to as a secondary switching center,
are associated with each of the party lines. For
shown in Fig. 1B show in detail the various cir
cuits comprising an exemplary embodiment of
example, party line 210 extends to the switching
and control circuits or secondary switching cen
the present invention. Figs. 5 through 11, inclu
ters 2|3, 2M and 2I5. The control equipment
sive, show in detail the circuits indicated in out
line form in the heavy line 350 of Fig. 3. Fur
2l4 is individual to a station at 2l9. Control
equipment 2 I5 is common to stations 2 I6, 2H and
thermore, said Figs. 5 through 1l', inclusive, of the
present application may be substituted without 10 2l8, while control equipment 2l3 is common to
stations 22H to 224 inclusive. Each of the outly
material alteration for Figs. 14, l5, 16, 17, 18, 19
and 20 of said Branson et al. application.. Said
ingl stations is provided with a receiving instru
ment, a transmitting equipment, and control
equipment. In the specific system described
other figures of said Branson application asso
ciated with the half-duplex line without material 15 herein, the transmitting equipment comprises a
keyboard perforator for perforating paper tape
modification.
`
Figs. 5 through 11 may also be substituted for
Referring now to Figs. 2, Sand 4 when arranged ’
as shown in Fig. 1A, Fig. 2 shows two typical .l
in accordance with the signals to be transmitted
and a tape controlled transmitter for transmit
party lines and the station and control equip
ting signals in accordance with the perforations
ment associated therewith. One party line is 20 in the tape. For example, at station 2l6 the
receiving'instrument and the keyboard> perfora
designated .2m-which comprises a receiving chan-`
nel 2H and' aftransmitting channel 2I2. Simi- , tor is illustrated diagrammatically and desig
lar‘ly, party line 26D comprises a receiving channel
nated 225 in Fig. 2, the transmitting distributor
is designated 235, while the control equipment is
26| and a transmitting channel 262. Both trans
mitting and receiving channels are illustrated in 25 designated 236. Similar equipment is provided
Fig. 2 and also Fig. 3 by means of'telegraph lines
at the other stations. In addition, station 219 is
provided with a receiving recorderV or reperforator
or conductors. It is to be understood, however,
that these lines or channels may include any type'
for againr perforating tape in accordance with
of telegraph transmission equipment normally
messages received from the system. This reper
employedfor the transmission of telegraph sig 30' forator is provided at those stations at which
naling pulses or code combinations of pulses.
other telegraph lines or circuits may terminate so
These lines or channels may, for example, include
that the messages intended for stations connected
to these other lines may be' recorded at station
open wire lines, cable lines, channels ‘of-voice fre
quency or high frequency carrier current systems,
2|@ and later automatically transmitted over the
radio systems, time division multiplex systems or
proper line without requiring the time of an op
erator to retransmit the message.
telegraph channels of composite telephone and
telegraph transmission systems or of any other
In order to transmit messages over this system,
type of pulse transmission channels -or systems
the attendant or subscriber at the outlying or way
suitable for the transmission of signaling pulses
stations perforates messages in paper tapes for
such as employed in telegraph> systems. The
later transmission over the system. Preceding
various party lines and channels thereof may in
each message, an address or group of switching
l clude or comprise any or all of the foregoing types
signals is perforated in the tape and following
of transmission systems or any or all combina
each message an end of message orV disconnect
tions‘of such 4types of transmission systems.
The transmission systems of the various types
comprising the- party lines operate in their usual
signal is also perforated in the tape. Following
and well understood manner so a description ofV
the end -of message‘signal, the subscriber may
perforate any -’address signal followed by another
message intended for the station designated by
the operation thereof need not be included herein
the address. Following this message and eachof
because it would serve no useful purpose and 'only
the messages, the operator will then perforate a
tend to obscure-the other elements and features 50 disconnectsignal` in the tape. Furthermore, the
operator or attendant will usually perforate Yan
of th‘evpresent invention.`
~
Each ofthe> party-lines shown in’Fig. 2 extends
end of transmission signal inthe tape` after the
to a plurality of outlying subscriber or way sta
disconnect signal following the last message avail
tions.` It is to be understood also that it is within
able for transmission from the station then trans
the scope of this invention to extend lines indi 55
vidually from one or more of the outlying sta
' The attendant or operator at the outlying sta
tions to the central switching exchange. In this
tion will then insert a tape in the transmitter forY
case certain of the control equipment associated
transmission over the system'. At a llater time
with each of the party lines need not be provided
the transmitter is started under thev control »of
as will be@ readily apparent to those‘skilled inV
an operator'or vswitching circuits at the/central
mitting.
»
Y
'
.
switching station.v` ThereafterY the messagesv are
Each of the lines whichextends to more than
transmitted to the central switching station and
the'art.
,_
'
_
one- outlyingl station is provided with control
equipment located at or near the outlying stations
of the party line. Control equipment maybe pro
recorded thereat. ’,
Y
` "
'
'
The circuits at-the central switching station
65 are illustrated~ in Figs. 3 and 4. Fig. 4 shows the
vided ïwhich is individual to each of the outlying
originating position 'or station at the central
or way stations in case theway stations are rather
switching station comprisingr a ' keyboard'. per
widely4 separated or the control equipment'may
forator v4| I,va monitoring receiving instrument 1
be provided commento a group >of outlying sta
410,' transmitter or transmitting distributor M2,
tic-,ns which vare located more~ closely together. In 70 controlrelays 4l3 and a director> circuitdlß. Fig.
4-also`shows'a miscellaneous intercept circuit 421
addition,A certain of the control equipment mayl
be individual Vto‘certaín outlying stations, While
other control equipment provided` for the same
party line may be _common
outlying stations.
"
'
to a plurality Qfftne
and a receiving reperforatorAZSand .a tape re
ceptaclev425. A` wilful 'intercept circuit 424 is
also. shown. This intercept circuit is provided
75 with a repeating instrument 420'comprislng a
2,412,198
recorder or reperforator 42| and a' transmitting
device 422. A director 423 is also associated with
the wilful intercept circuit.
Each of the party lines Iterminating at the
switching office or center is provided with an in
coming line .circuit 322 and a receiving only ma
chine 323, a storage repeater 324 and associated
transmitter 325. Incoming line circuit 322 causes
mitters associated with any' party line during’
certainv cycles of operation of .the transmitter
start circuit. According to the present invention
the automatic skip feature is m-ade ilexible- so
that the testing of different transmit-ters may be
skipped during diiferent cycles of operation of
the transmitter start circuit. In this way an ex
tremelyflexible arrangement is provided for con
trolling the transmission from the respective
the messages intended for the central switching
station to be lrecorded on the receiving only re 10 transmitters associated with the party line. Not
only may the order of testing be varied at will
ceiver 323 and causes the messages intended for
but also the frequency or relative frequency of
other stations of the system to be recorded by the
testing and initiation of operation of the trans
reperforator 326. Director circuit 321 is asso
mitters may be readily varied during any cycle cf
ciated with :the transmitter 325 and serves to con
operation of the transmitter start circuit in ac
nect the transmitter 325 selectively lto any of the
cordance with any predetermined plan or system.
llines terminating at the central switching station
The circuit details of one exemplary embodi
under control of the address characters preced
ment of the invention showing how the varying
ing each message.
of the frequency of testing of the transmitter
Each of the party lines is also provided with
`may
be accomplished in accordance with the
.transmitter start circuits, such as 3|0, and out
present invention is shown in Figs. 5 through 1l,
going line circuits and equipment for transmit
inclusive, when arranged adjacent one another
ting messages over the party line. An outgoing
as shown in Fig. 1B,
line circuit is «associated with party line 2 l0.
Inasmuch as the present invention relates more
Briefly, messages directed to stations of party line
2|I ‘are transmitted to storage repeaters asso 25 particularly to the automatic operation of the
transmitter start circuit, the operation of .this
ciated with line 2| | under control of the director
circuits of the lines upon which the messages ` cir-cuit under manual control will not be repeated
here since it is described in detail in the above
originate for later transmission over the outgoing
identified application of Branson et al. incorpo
lines.
rated herein and to which reference is made for
Figs. 2 and 3 also show‘a .trunk circuit 299 com
prising two transmission channels 29| and 292 ex
tending to a distant switching center 295. The
terminal equipment associated with the trunk
circuits is similar to the terminal equipment asso»
ciated with each »of the party lines as described
above.
' The operation of the various circuits referred to
above is described in detail in the above-identiñed
copending patent application of Branson et al.
Since the respective circuits referred to above
forming parts of the system referred to herein
operate in substantially the same manner yas de
scribed above in said patent application of Bran
son et al., which patent application has been
made a part hereof as if fully included herein, a
more detailed'description has therefore not been
repeated.
As stated above, the attendants at the outlying
stations will insert the tape in the tape -control
transmitters located at .the respective stations.
Thereafter the operator at the central switching
station will manually set into operation the trans
mitter start .circuit which will cause certain sig
nals to be transmitted over the receiving channel
of the respective party lines for testing the trans
mitters associated there-with and initiating opera
tion of these transmitters which are supplied with
storage material available for transmission.
In the system described in the above-identified
application of Branson et al., it is necessary for
the operator to start or initiate the operation in
the transmitter start circuit manually the first
time each day. Thereafter the operator may op
erate «an automatic key which will »cause the
transmitter start circuit to automatically .test the
transmitters associated with the respective` party
lines in rotation. Means are also provided for
enabling the operator by the operation of a man
ual key to prevent the testing of :any one or more
a detailed description of the operation of the
circuit under manual control.
'
i
Assuming for purposes of illustration that the
circuit has been set into operation and transmis
sion has been started from some one ofthe trans
mitters associated with the> party line to which
the transmitter start circuit shown in Figs. 5
through 1l, inclusive, is connected. Under these
conditions the stepping switch comprising brush
arms 50| through 506, inclusive, has been ad
vanced Ito the No. 5 position by means of magnet
501 in .the manner set forth in the above-identi
ñed application of Branson et al. Similarly, the
stepping switch comprising brush arms 508 to 5| 3
as well as the stepping switch :comprising arms
5 | 5 and 5 | 6 have stepped to terminals assigned to
|the transmitter which has been set into operation.
In addition, relay 656 and 601 and 609 are main
tained operated so long as the transmitter set
into operation continues to transmit signals to
the central switching station’. Assuming further
for the purpose of illustration that the automatic
start key 5|9 has lalso been operated after the
transmitter has been set in-to operation.` Under
these circumstances, a circuit is completed for the
operation of relay 608 which relay remains
operated as long as the automatic key 5 I 9 remains
operated. Further assume that the stepping
switches comprising brushes 51| to 511, inclusive,
have been positioned in the position shown in the
drawings in any suitable manner such as. will be
described hereinafter.
l
During the transmission of signals from any
of the transmitters of the party line, a ground
connection is maintained to lead 2136 by the
incoming line circuit in a manner described in
» the above-identified application of Branson et al.
S0 long as this ground is maintained on lead 2136
the circuits are maintained in the position de
of the transmitters associated with the respective 70 scribed above. It should be noted that one of
party lines.
In accordance with the present invention an
additional key and group of circuits and appara
tus are provided which will automatically cause
the. skipping of .the testing of certain of the trans
the lamps 52| to 53B, inclusive, associated with
thev operating transmitter will be lighted during
operation of that transmitter.
Atn the completion of transmission from the
transmitter in question or underv certain trouble
`
2,412,198
8
conditions vas set forth in the above-identiiied‘ap
in progress of transmission at the time relay _80|
plication of Branson et al., the incoming line cir
operates.
,
'
cuit of the party line in which the transmitter
The operation of relay 103 completes an ob
start circuits in Figs. 5 to 11, inclusive, will re
vious circuit for the operation of relay 602.
move ground from lead 2136 and thus permit Cl
The operation of relay 602 completes a. circuit
relay 606 to release. The release of relay .606
for maintaining relay 10| operated and also com-.
completes a circuit for the operation of relay 6| I
pletes a circuit for the operation of either relay
at this time. Relay 6|| in operating. causes the
9|4 or 923, depending upon which of îthe two
C stepping switch comprising brush arms 50| to
transmitters shown in either Fig. 10 or l1 was
506, inclusive, to be stepped to its initial position. 10 the last to transmit. If the transmitter shown
A detailed description including the tracing of the
in Fig. lf2-was the last transmitter to transmit
circuits of the various relays and the times of
relay =9:|4 will operate whereas if the transmitter
operation thereof during the return of this switch
shown in Fig. 11 was the last transmitter to trans
to its initial position has not been repeated here
mit, relay 923 will operate. The operation of
because lit is clearly set forth in the above-iden
either one or the other of these relays prepares
tiñed application of Branson et al. and inasmuch
circuits for the operation of the corresponding
as the circuit works in substantially the same
transmitter under control of the transmitter start
manner at this time, littleyif anything, can be
gained by further so complicating the present
circuit as will be described hereinafter.
The
operation of relay 602 also completes a circuit
20 for the operation of relay `603 which relay in turn
. During the return of the stepping switch com
completes a circuit for the operation of stepping
prising brush arms 50| to 506, inclusive, to its
magnet 5|4. The brush arms 508 and 5|3 do not
initial position or to a position equivalent to its
advance at this time, however, because they ad
initial position, various relays may operate.
vance upon the release of magnet 5|4 and not
However, the Yoperation ol these relays at this 25 upon the operation thereof.
time is without. significance. Consequently, their
The operation of relay 602 also completes a
operation need not be described at the present
circuit for the operation of the stepping magnet
time.
501 but the associated brush arms 50| through
When the C stepping switch returns to its No.
506 do not advance at this time. However, the
1 position, relay 6|| releases and prevents the 30 operation of the stepping magnet 501 removes
further advance of the switch at this time. The
the short circuit from around the upper winding
return of this switch to its No. 1 position com
of relay 104 and permits this relay to operate.
pletes a circuit kfor the operation of relay 10|
The operation of relay 104 completes a circuit for`
which relay operates and completes a circuit for
maintaining itself operated under control of relay
disclosure.
.
»
the operation of relay 102. Relay 102 in operat
602. The operation of relay 104 interrupts‘the
ing completes a circuit for maintaining itself
operated under control of various relays includ
ing relay 606. The operation of relay 102 com
pletes a circuit for the operation of relay 80|,
operating circuit from the stepping magnet 501`
which permits magnet 501 to release and advance
the operation of which relay stops the operation
of either of the transmitting instruments shown
in Figs. l0 and 11. The operation of relay 80|
interrupts the circuit of release magnets of these
transmitters and thus insures that the transmit
ter will come to rest at the completion of the
code combination then in progress of transmis
sion over the party line.
The operation of relay 102 in addition removes
ground from the right-hand terminal of con
denser 1|| and permits this terminal to be
charged from battery 1|6 through high resist
ances 55| and 533 in parallel. Condenser 1I| is
connected through high resistance 1|5 to the grid
the brush arms 50| through 506 one step to their
No. 2 position. Brush arm 50| in advancing one
40
step interrupts the operating circuit of relay 603
and thus permits relay 603 to release and in turn
releases stepping magnet 5|4. The release of
stepping magnet 5|4 causes the brush arms 508
through 5|3, inclusive, to advance one step and
thus partially condition the transmitter start cir-cuit fcr transmission of the ñnal code in the
transmitter start pattern which designates the
transmitter that is to be tested and set into oper
ation by the transmitter start circuit if it is pro
vided with storage material available for trans
mission. The advance of brush arm 5|2 at this
time also interrupts the locking circuit ofv relay
609. The release of relay 609 completes a cir
of .tube 1|0. By a proper choice of the values of
cuit for the operation of relay 105.
`
resistances 1| 4 as well as the constants of tube 55
The operation of relay 104 again connects
1I0, the size of condenser 1| I, and potential »bat
ground to the right-hand terminal cf condener
tery 1|6`4of the anode path through tube 1|0,
1|| and thus to the grid of tube 1i0. As stated
this vtube is maintained non-conductive so long
above, with ground connected to the grid of tube
as ground is connected to the right-hand termi
1|0 the anode-cathode path is blocked so that
nal of condenser 1|| and for an appreciable in 60 relay 103 will release and in turn cause the re
terval of time thereafter until the right-hand ter
lease of relay 602. Relay Yi502, howevery is slow
minal of condenser 1|| is charged to a predeter
in releasing so that various circuits and relays
mined positive potential. In an exemplary ern
will have sufficient time to function, as pointed
bodiment of the present invention, the values of l out above, before »relay 602 releases. The- re
the resistances 55| and 533, the size of condenser 65 `lease of relay 602 in turn causes the release off
relay 104.
`
1| |, the constants of tube 1|0, and the value of
~ The release of relay 602 at this time completes
resistance 1|4 have beenselected so that it re
a circuit for the operation of either the distribu
quires approximately .'1 of a second after ground
is removed from the right-hand terminal of con 70 tor release magnet |041 or Hill, depending upon
which of the transmitters was previously trans
denser 1|| for tube'1l0 to pass suiiicient anode
mitting. Assume for the purpose of illustration
current to operate relay 103. This .7 of a sec
relay 9|4 previously operated due to the fact that
ond allows ample time for either of the transmit
the transmitter shown in Fig. 10 was the last
ting instruments shown in Fig. 10 or 11 to com
transmitter to transmit prior to the 'operationsof
plete the transmission of the code combination 75 relayV 00|. Under these circumstances theidis
2,412,193
9
tributor release magnet |041 will operate upon
the release of relay 602. The operation of the
distributor release magnet |041 at this time re
leases the distributor shaft I05| for rotation
through one revolution. During the rotation
through this revolution a blank code combination,
that is, a code combination in which all the im
pulses are spacing, is transmitted over the receiv
ing channel oi party line 2I0.
'
Near the beginning of the revolution ci _shaft 10
|05! the auxiliary contacts |050 are closed and
complete a circuit for the operation of relay 605
which relay operates and completes a circuit'for
maintaining itself operated under control of re
lay 602. The operation of relay 605 interrupts
the operating circuit of magnet |041 thus insur
ing that this magnet will release and stop the
10
|05I_contacts |050 will close and complete a cir
cuitfor the operation of relay €505 which relay
operates and completes a circuit for maintaining
itself operated under -control of relay 602. The
operation of _relay 605 also interrupts the circuit
of the distributor release'magnet |ûfl1 and permits
this magnet to release and stop the transmitter
shaft I05I at the end of the revolution during
which the line feed code combination was trans
mitted.
_
f
«
At the end of the third ¿.7 second time interval
relay 103 will _again operate and complete «a cir
cuit for the reoperation »of relay G02. Relay 602
in operatingat this _time interrupts the locking
circuit of relay y6135 and permits relay 605 to re
lease. The operation of relay 552 at this time
again completes a circuit for they operation of the
stepping magnet 501. The >operation of the step
distributor shait I 05| at the end of the revolution
ping magnet 501 permits the operation of relay
during which the blank code combination has
104. The operation of relay 10ft interrupts the
20
been transmitted.
operating
circuit oi magnet 501 and permitsthis
IThe release of relay 602 removes ground from
magnet to release and advance the brush ‘arms
the right-hand terminal ofv condenser 1I I, which
50| through 505 to their No. ¿i position. The op
condenser again starts to charge from battery 1I6
eration
of relay ‘|04 connects ground to the right
through the high resistances 55| and 553, as
hand terminal of condenser 1II and thus inter
25 rupts the current flowing through the anode
described above.
If the terminal upon which brush arms »508
cathode circuit of tube 1I0 and the winding of
through 5|5, inclusive, have been advanced to
relay
103 thus causing the release-of relay 103.
and are resting upon during the time brush arm
Relay 103 in releasing interrupts the operating
50| is in its No. 2 position has been assigned to a
circuit of relay 062. Relay 602m turn releases
station upon which one of the skip keys 54|
after
a short interval of time and removes ground
through 550, inclusive, has been operated, a cir
from the right-handwvinding terminal of‘ con
cuit will again be completed for the operation
denser 1I I. Inasmuch` as brush arm 504 is now
or" relay 6&3 and the stepping magnet 5|4 will
in its No. 4 position the charging circuit of the
cause the stepping switch to advance to the first
right-hand terminal of condenser 1! I noW extends
terminal on which the associated skip key has not ,
from battery 1 I ß through the right-hand portion
been operated.
of `resistance .1M and resistance 552 in parallel
At the end of approximately .7 of a second after
with
resistance 55|. The time constants of con
the release of relay 652 condenser 'III will `again
denser 1I I, together` with the constants of the
be charged to the _potential required to initiate
circuits of tube 1 iii, are such that it requires ap
a discharge current through the-anode circuit of
proximately 1.9.seconds for the right-hand ter
tube ‘H0 and the Winding of relay 103. The op
minal of condenser 1I l to be charged tothe value
eration of relay 103 at this time again completes
required to initiate the discharge through tube
a circuit for the operation of relay 602. The re
1I0.
.
operation of relay 602 causes relay 505 to re
Meantime the release of relay 602 again com
45
lease.
pletes a circuit for the operation of the distributor
The reoperation of relay 502 again completes a
release> magnet |041 thus permitting the dis
circuit for the operation of stepping magnet 531
tributor shaft I05| to rotate through a third
which magnet in operating permits the reopera
revolution. Atthís time the brush arms ‘50|
tion of relay 104. Relay 104 operates and inter
through 5% are in their No. 4 position. Conse
rupts the operating circuit of magnet 501, thus »
quently the code combination transmitted by the
permitting this magnet to release and advance
distributor at this time will be determined by the
the brush arms 50i through 505, inclusive, to
connections to the terminals of the banks coop
their third position. The operation of relay 104
erating with brushes 508, 509, 5I0 and 5I3 upon
again connects ground to the right-hand terminal
which these brushes are resting at this time.
of condenser 'FII and thus causes the release of l
Near the beginning of the revolution of shaft |05|
relay 103. Relay 103 in releasing again permits
contacts |050 _will again be closed and complete a
relay 602 to release and remove ground from the
circuit for the operation of relay 605. Relay 605
right-hand terminal of condenser 1H which ter
completes a circuit for maintaining itself oper
minal again starts to charge to the potential re
ated under control of relay 602 and interrupts the
quired to again initiate a discharge through
operating circuit of the releasemagnet |041 thus
tube -H0.
insuring that thedistributor shaft I05| will stop
Meantime, however, the release of relay BSZ
at the end of the third revolution.
interrupts the locking circuit of _relay 104 and
On the transmission of this third code com
permits this relay to' release. The release of
bination a complete set of transmitter start sig
relay 6(22 also again completes a circuit for the
nals has been transmitted over the receiving
operation of the distributor start magnet IEM
and permits the distributor shaft |€i5i to rotate
through another revolution. This time the brush
arms 50| through 506, inclusive, are in their No. 3
position Where they condition the'co'ntacts con
trolled by the distributor shaft I 95'! so that a
line feed code combination is transmitted over
the receiving channel of the party line at this
time.
Near the beginning of the vrevolution of shaft
channel of the party line to which the trans-_
mitter start circuit is connected. If the trans
mitter to which this set of transmitter start sig
nals has been assignedfis provided with storage
material available for transmission, transmission
to the central oiiice will be initiated therefrom
some time during the 1.9 second charging interval
of condenser 1|I or during the subsequent .7 sec
ond charging interval to be described. At the
l1
.
end of the 1.9 second charging interval relay
103 will again operate and complete a circuit for
the operation of relay 602 which relay operates
at this time and completes a circuit for the op
eration of stepping magnet 501. Magnet 501 op
erates and removes the short circuit from around
12
oi.' the transmitter start circuit will be repeated.
Assume now that the transmitter start circuit
has functioned as described above and has trans
mitted the third character or code combination
of a transmitter start pattern during the 1.9 sec
onds during which brush arms 501 through 506
the upper Winding of relay 104, thus permitting
'this relay to operate and interrupt the operating
Vcircuit of the stepping magnet 501. The release
arev in their No. 4 position and that thereafter
The operation of relay 104 also completes a
circuit for connecting ground to the right-hand
_terminal of condenser 11 l thus causing relay -103
transmitter assigned to the particular trans
mitter start pattern which has just been trans
these brush arms advanced to a No. 5 position
and caused the operation of relay 601 as described
of magnet 501 causes the brush arms 501 through 10 above. In thisv case, however, assume that no
»506 to advance to their No. 5 position.
material was available for transmission from the
to release which in turn causes the release of re
lay 602.
mitted from the transmitter start circuit. Under
15 these circumstances, no signals can be received
by the incoming line circuit during the .'7 of a sec
ond during which brush arms 60| through 506
remain in their No. 5 position. Consequently no
thus permits this terminal to again be charged
ground will be connected to lead 2136 during this
from battery 116 through resistances 553 in par 20 time and relay 606 will not operate. At the end
allel with 551. The time constant of this charg
of the .7 second time interval, the potential on
ing circuit, as pointed out above, is approximately
the right-hand terminal of condenser 11| will
‘.7 of a second.
,
reach the value required to initiate a iiow of
The release of relay 602 removes ground from
the right-hand terminal of condenser 111 and
With brush arm 501 in its No. 5 position a cir
current through the anode-cathode path 110 and
cuit is completed for the operation of relay 601.
cause the operation of relay 103. Relay 103 then
With relay 601 operated a circuity is completed
operating completes the circuit for the operation
from conductor 2136 extending from the incom
of relay 602. Relay 602 in operating at this time
ing line circuit to the winding of relay 606. If the
completes the circuit for the operation of the
corresponding transmitter has started to trans~
stepping magnet 501> which magnet in operating
mit message material, relay 606 will operate and 30 removes a short circuit from around the upper
interrupt the locking circuit of relay 102 thus
winding of relay 104 and permits this relay to
permitting relay 102 to release.
operate. The operation of relay 104 interrupts
The operation of relay 606 also completes a
the operating circuit and stepping magnet 501
circuit for the operation of the stepping magnet
and permits this magnet to release and advances
511 thus permitting this magnet to operate and
brush arms 501 through 506 to the No. 6 posi
remove a short circuit from around the lower
tion. The operation of relay 104 also connects
winding of relay 609, whereupon relay 609 op
ground to the right-hand terminal of condenser
erates and interrupts the operating circuit of
111 thus discharging this condenser and causing
stepping magnet 511 thus causing the advance
the release of relays 103 and 602.
of brush arms 515 and 516. The above cycle of 40
When brush arm 501 reaches its No. 6 posi
operations of magnet 511 and relay 609 is re
tion, a circuit is complete for the operation of
peated until the brush arms 516 and 515 rest
relay 611 and brush arms 501 through 506 re
in the same position as the brush arms 501
'stored to their No. 1 position again. The above
through 506. At this time a circuit is completed
cycle of operation is then completed and a differ
through the upper winding of relay 609 for main
ent transmitter start pattern transmitted caus~
taining this relay operated.
' '_I‘he operation of relay 606 interrupts the op
erating circuit of relay 105 and permits relay 105
to be released. Release of relay 105 interrupts
the operating circuit of relay 101 and either
causes this relay to release or prevents its opera
tion.
The release of relay 102 as described above in
terrupts the operating circuit of relays 80| and
914 which in turn allows the operation of the ,
ing the brush arms 508 through 513, inclusive,
to advance one step during each cycle of op
eration of brush arms 50| through 506. Conse-'
quently, a different transmitter start circuit pat
tern is usually transmitted during each cycle of
operation of brush arms 501 through 506, un
less, of course, the same code combination is set
up on adjacent terminals of the banks cooper
ating with brush arms 508, 509, 510 and 513.
When the brush arms 508 through 513 step
off of the No. 10 terminals and onto the N ter
minals brush arm 511 completes a circuit for
transmitting device shown in Fig. 10 under vcon
trol of tape 1030 and thus resumes transmission
of the interrupted message.
the operation of relay 595. Relay 595 in operat
The release of relay 102 also connects ground
ing completes circuits for the operation of step
to the right-hand terminal of condenser 11 1, thus
ping magnets 593 and 594 and relay 603. Re
discharging the condenser and interrupting the 60 lay 603 in operating completes a circuit for the
anode current of tube 110 and preventing the op
operation of stepping magnet 514. The operaf
eraton of relay 103.
'
tion of magnets 593 and 594 interrupts the oper
' Thereafter circuits are maintained in this con
ating circuit of relay 595. Relay 595 in turn
dition so long as the transmission is received from
any transmitter associated with the party line.
At the end of the transmission from this trans
mitter, or in response to a pause in transmission
longer than a predetermined length, ground will
be removed from lead 2136 by incoming line- cir
cuit and interrupt the operating circuit of relay
606. The release of relay 606 at this time will
causes the release of magnets 593 and 594 and
relay 603. Relay 603 in releasing causes the re
lease of magnet 514. The release of magnets
514, 593 and 594 causes the respective brush
arms 508 through 513 and 511 through 511 to
be advanced one step. Consequently brush arms
508 through 513 are advanced from their No.
10 position to their No. l position without re
maining in their N position.
The above cycle of operations of the trans
cause relay 61 1 to operate as described above and
advance the brush arms 501 `through 506 to their
No. 1 position where the above cycle of operation 75 mitter start circuit is repeated’ until either trans
2,4125198
13
mission is started from one of the transmitters,
or until brush arms 508 through 513 are ad
vanced to the same position as brush arms 515
and 516. It will be recalled that brush arms 515
and 516 were advanced to the position indicat
ing the last transmitter to transmit. When brush
arms 508 through 513 have advanced through al1
of their positions and have again returned to
the position assigned to the last transmitter to
,
V14
As` indicated above, if it is desired to prevent
the testing of any of the transmitters, skip keys
541 through 550 have been provided. If any of
these keys is operated, the corresponding relays
581 through 590 are also operated. As described
above, when brush arms 501 through 506 are
advanced to their No. 2 position and brush arms
598 through 513 are advanced to terminals, the
corresponding skip keys and associated skipre
transmit without finding any stored material 10 lays 581 through 590 of which are operated, -brush
arms 508 through 513 will be advanced to their
available for transmission from any of the
next position or will be advanced step by step
transmitters, they Will cause the transmitter
until they rest upon a set of terminals asso
start circuit pattern assigned to that transmit
ciated
with some transmitter or station the skip
ter to be retransmitted to the transmitter start
circuit. However, with brush arms 50| through 15 relay of which has-not be operated. Thus it is
possible to prevent testing of any of the trans
506 in their No. l position causing brush arms
mitters during the operation of transmitter start
508 through 513 to advance to the same position
circuit by the operation of any of the skip keys
as brush arms 515 and 516, a circuit will be com
541 through 550.
pleted through the upper winding of relay 609
In accordance with the present invention, pro
thus causing the operation of this relay. Inas
vision has been made to cause the transmitter
much as relay 105 has been operated during the
start circuit to automatically skip any one or
testing of all the other transmitters, the opera
more of the transmitters during any cycle of op
tion of relay 609 completes a circuit for the op
eration
of the transmitter start circuit. Means
eration of relay 191. Thereafter the brush arms
501 through 506 are advanced to their No. 1, No. 25 has also been provided for varying the transmit
ters skipped during different cycles of operation
2, No. 3 and No. e positions during the transmis
oi the transmitter` start circuit. This additional
mission of respective portions of transmitter
equipment comprises a group of brush arms 511
start pattern assigned to the last transmitter
through 511 and associated banks of contacts, as
which transmitted. If transmission is not in
shown in Fig. 5. It will be readily understood by
itiated from this transmitter during the time .
persons
skilled in the art that a brush arm and
brush arms 501 through 506 are in their No. 5
an associated group of contacts is provided for
position, then at the end of the .'7 seconden the
each of the stations or transmitters to be started
No. 5 position of brush arms 501 through 506,
in addition to the brush arm 511. These brush
relay 103 will operate and complete the circuit
for the operation of relay 602. Relay 502 will i arms are advanced by means of stepping magnets
593 and 594 or additional magnets to these if more
operate and cause brush arms 501 through 506
are required. A recycle key 591 has been pro
to be advanced to the No. 6 position due to the
vided and when operated completes the circuit for
successive operation of stepping magnet 501 and
the operation of relay 592. Relay 592 when op
relay '104 and the subsequent release of magnet
erating completes the circuit for maintaining it
501 and relay 194. This time relay '101 is oper
self operated if brush arm 511 is in any position
ated and consequently relay 61 1 will not operate.
other than its normal or No. 1 position. The op
The right-hand terminal condenser 111, which
eration of relay 592 also completes the circuit for
Was Dl‘eVîOuSly discharged due to the combined
operation oi relays 602 and 104, will again start
the operation of the driving relay 595 if brush
arm 5,11 is in any position other than its No. 1
position. The operation of relay 595 completes
ever, the charging circuit extends through re
the circuit for operation of stepping magnets 593
sistance 551 only. The value of resistance 551,
and 594. The operation of these magnets inter
together Awith the value of condenser 111 and
rupts the operating circuit of relay 595, permits
the other constants of the tube 110 and associ
ated circuits are such as to require approxi 50 this relay to release, and releases the magnets 593
and 594, thus advancing all the brush arms 511
mately two minutes for condenser 111 to be
through 511 to their next position. The above
charged suriiciently to cause the operation of re
cycle of operation is then repeated until brush
lays 103 and 602. Upon the operation of these
arms 511 through 511 are restored to their initial
relays, brush arms 501 through 506 will be ad
or No. 1 position.
f
vanced to the next position and the above cycle
If key 518 is operated to the position shown in
of operations completed until brush arms 501
the drawings when key 519 is operated then each
through 506 are advanced through the interven
time brush arms 508 through 513 are advanced
ing positions to their No. 1 position. As de
from their No.- 10 position through their N posi
scribed in the above-identified application,
Branson et al, a suitable number oi steps of two 60 tion to their No. 1 position, a circuit will be com
pleted for the operation of relay 595 and the sub
seconds may be provided depending upon the
sequent
advance of brush arms 511 through 511
stripping or connections to the contact termi
to their next position. The terminals cooperat
nals cooperating with brush arm 502. Further
ing with the brush arms 512 through 511, inclu
more the number of steps may be varied depend
sive, are connected to the upper windings of re
65
ing upon whether or not the outgoing or receiv
lays 531 through 590, inclusive, and consequently
ing channel of the associated party line is em
depending upon the connection of terminals to
ployed in the transmission of messages to some
these windings, relays .581 through 590 will be
one or more of the stations associated with the
operated when the brush arms 512 through 51-1
party line.
Thus during periods when no message mate 70 are in various of their positions. When'these re
lays are operated, they will cause the transmitter
rial is available for transmission, each of the
start circuit to skip the testing of the associated
transmitters is tested in rotation and then the
transmitter. Thus by properly connecting the
circuits pause for a predetermined interval of
bank terminals associated with the brush arms
time, after which the transmitters are again
75 512 through 51-'1 to the upper windings of the skip
the charge from battery 116. At this time, hoW- ‘
tested.
'
f
2,412,198
'.15
relays 58| through 590, the testing of the various
transmitters will be skipped during each cycle of
operation of the transmitter start circuit and the
respective transmitters skipped will be auto
matically varied in accordance with the connec
tions to the bank terminals cooperatingr with
brush arms 512 through 511.
'
-
v16
circuit during different ones of said cycles of op
eration thereof.
‘
.
'
4. In a telegraph system, a plurality of geo
graphically separated storage controlled trans
mitters, a common telegraph transmission chan
nel extending .to each of said transmitters, a start
circuit for testing said transmitters one at a time
and in rotation for the presence of storage ma
terial available for transmission therefrom one at
a time and in successive order, automatically con
The 'automatic skip equipment, in accordance
withthis invention, may be disabled by the op
eration of key 518 to the position opposite to the
position shown in the drawings. The operation of
key 518 to that position disables the recycle key
59! and prevents the operation of the skip relays
trolled apparatus for causing said start circuit
to skip and thereby omit testing different ones of
said transmitters during predetermined sequences
58! through 590 under control of brush arms 512
of testing,
through 511 and thus renders the automatic skip
equipment ineffective. Consequently, under these
conditions the transmitter start circuit and equip
ment operates substantially as set forth in the
above-identiñed application of Branson et al, in
v
-
-
5. In a telegraph system, a plurality of tele
graph transmitters associated with a channel of
transmission for transmitting thereover one at la
time, a control circuit for transmitting to said
transmitters a plurality of control patterns of
corporated herein.
20 code combinations for selectively initiating trans
'I'his additional equipment in no way interferes
mission from any of said transmitters and auto
with the operation of the transmitter start cir
matic means for automatically varying the order
cuit during manual operation of the transmitter
of supplying said patterns to said control circuit.
start circuit because battery is connected to the
6. In a telegraph system, a plurality of geo
upper windings of skip relays 58| through 590 25 graphically separated telegraph transmitters as
only during automatic operation by the operation
sociated with a channel of telegraph transmission
of relay 608 which relay is operated only during
for transmitting thereover one at e, time, a trans
automatic operation of the transmitter start cir
mitter start circuit for transmitting to said trans
mitters a plurality of control patterns of code
combinations for selectively initiating transmis
cuits.
The transmitter start circuit shown in detail -
in the drawings provides numerous other features
and manners of operation which are fully set
forth in the above-identiiied application of Bran
son et al. However, inasmuch as these other fea
tures do not affect the operation of the automatic
skip feature, their` description has not been re
tation, and control apparatus operative concur
rently with said transmitter start circuit for re
ducing the supply of certain of said patterns to
peated herein. It is to be understood, however,
said transmitter start circuit.
that these features are provided and operate in
7. In a telegraph System, a plurality of tape
controlled transmitters, a telegraph transmission
-channel extending to all of said transmitters,
substantially the same manner as described in the
above-identiñed application of Branson et al.
What is claimed is:
1. In a telegraph system, a plurality of tape
controlled transmitters for transmitting over a
common channel of transmission, a control cir
cuit for testing said transmitters one at a time
-inr sequence for the presence of stored message
material available for transmission, apparatus for
sion from any one of said transmitters and auto
matic means for supplying said patterns to said
transmitter start circuit one at a time and in ro
switching apparatus for connecting each of said
transmitters to said channel, a transmitter start
circuit for controlling said switching apparatus
comprising apparatus for sending the transmitter
start patterns Aassigned to each of said transmit
ters one at a time and in rotation, and automati
cally controlled apparatus for varying the fre-_
quency of supply of predetermined of said pat
causing said control circuit to skip and thereby
terns during predetermined rotations of the op
vomit testing of any one or more of said transmit
ters, and apparatus for automatically changing 50 eration of said transmitter start circuit,
said control circuit to change the transmitter or
8. In a telegraph system, a plurality of tape
controlled transmitters, a telegraph transmission
channel extending to all of said transmitters,
switching apparatus for connecting each of said
controlled transmitters arranged to transmit over 55 transmitters to said channel, a transmitter start
circuit for controlling said switching apparatus
a common channel of transmission, a transmitter
comprising apparatus for sending transmitter
start circuit for cyclically testing each of said
start patterns assigned to each of said transmit
transmitters for record material available for
ters one at a time and in rotation, apparatus for
transmission, apparatus for causing` said start
circuit to omit testing of predetermined ones of 60 preventing the supply of any of said patterns dur
ing any rotation of the operation of said transmit
said transmitters, and apparatus operativeinci
ter start circuit, and automatically .controlled ap
dent to the operation of said start circuit for
paratus for cyclically varying the number of
changing the transmitter or transmitters skipped
transmitters
omitted during the operation of said
-during successive cycles of testing said transmit
transmitters skipped during successive sequences
of testing said transmitters.
2. In a telegraph system, a plurality of record
65 transmitter start circuit.
ters.
,
,
K
3. In a telegraph system, a pluralityof record
controlled transmitters arranged tol transmitover
Y
9. In a telegraph system, a plurality of tape
controlled telegraph transmitters, e, telegraph
transmission channel extending to all of said
a common channel of transmission, a transmitter
transmitters, switching apparatus for connecting
start circuit for cyclically'` testing each of said 70 each of said transmitters to said channel, a trans
@transmitters for record material available for
mitter start circuit for controlling said switching
transmission, apparatus for causing said start
apparatus comprising apparatus for sending thev
circuit to omit testing of any of said transmitters,
transmitter start patterns assigned to each of
.and apparatus for automatically changing the in
said transmitters one at a time and in rotation,
dividual transmitters skipped over by said start 75 apparatus for causing said start circuit to skip
2,412,198
17
transmission of said start patterns, manually con
trolled apparatus for designating the patterns to
be skipped by said start circuit, and automatic
apparatus to automatically vary additional pat
terns skipped by said start circuit.
10. An automatic telegraph transmitting ar
rangement for transmitting a series of telegraph
signal patterns one after another, automatic skip
ping means for causing said transmitting arrange
ment to skip the transmission of different ones of
said telegraph signal patterns, and means auto
matically operable between said series of patterns
to change the patterns to be skipped during the
transmission of the succeeding series cf patterns.
11. An automatic telegraph transmitting |ar
rangement for cyclically transmitting a series of
different telegraph signal patterns one after an
other, apparatus for causing said telegraph lar
rangement to omit the transmission of any of said
patterns, manual control means for designating
the patterns to be omitted, and automatic control
means for automatically designating the patterns
to be omitted during diiîerent cycles of operation
of said transmitting arrangement.
12. In a telegraph system, a plurality of record
controlled transmitters arranged to transmit over
a common channel of transmission, a transmitter
start circuit for cyclically testing said transmit
ters for record material available for transmission,
and apparatus for automatically changing the
number of times at which certain of said trans
mitters lare tested for record material available for
_ transmission, as compared to the number of times
other transmitters are tested.
13. In a telegraph system, a plurality of tele
graph transmitters associated With a channel of
transmission for transmitting thereover one at a
18
transmitter start circuit for automatically vary
ing the relative number of occasions of testing of
certain of said transmitters for record material
available for transmission.
15. In a telegraph system, a plurality of tape
controlled transmitters at least one of which is
located remote from the other of said transmit
ters, a telegraph transmission channel extending
to all of said transmitters, switching apparatus
for connecting each of said transmitters to said
channel, a cyclically operating transmitter start
circuit for controlling said switching apparatus,
and apparatus operative incident to cycles of op
eration of said transmitter start circuit for caus
ing certain of sai-d transmitters to be connected
to said channel less frequently on some cycles
than others of said transmitters.
16. In a telegraph system, a plurality of record
controlled transmitters arranged to transmit over
a common channel of transmission, a transmit
ter start circuit for testing each of said transmit
ters for record material available for transmis
sion and apparatus operative incident to the op
eration of said transmitter start circuit for cy
clically changing the order in which said trans
mitters are tested for record material available
for transmission.
17. In a telegraph system, a plurality of record
controlled transmitters arranged t0 transmit over
a common channel of transmission, a transmit
ter start circuit for cyclically testing each of said
transmitters for record material available for
transmission, apparatus for controlling said start
circuit for testing certain of said transmitters
.. oftener than others of said transmitters, and
means for automatically changing in accordance
with a predetermined schedule the number of
times a predetermined transmitter is tested rela
time, la control circuit for transmitting to said
tive to the number of times others of said trans
transmitters a plurality of control patterns of
code combinations for selectively initiating trans 40 mitters are tested for record material available
for transmission.
mission from any of said transmitters, and ap
18. In a telegraph system, a plurality of tape
paratus operative incident to the operation of
controlled transmitters, a telegraph transmission
said control circuit for automatically changing
channel extending to «all of said transmitters,
the number of times certain of said control pat
terns are transmitted relative to the number of 45 switching apparatus for connecting each of said
transmitters to said channel, a transmitter start
times others of said control patterns are trans
circuit for controlling said switching apparatus
mitted.
comprising equipment for sending a plurality of
14. In a telegraph system, a plurality of record
different transmitter st-art patterns each of which
controlled transmitters, a common channel of
assigned to one of said transmitters, apparatus
transmission extending adjacent said transmit 50 is
operative incident to the operation of said trans
ters, switching equipment adjacent said transmit
mitter start circuit for causing one or more of
said patterns to be transmitted more frequently
to said channel one at a time, a transmitter start
than others of said patterns, ‘and means for
circuit for cyclically transmitting a plurality of
changing
the transmission of certain of said pat
control patterns of code combinations for con 55
terns relative to transmission of others of said
trolling said switching apparatus to selectively
i patterns.
test said transmitters for record material avail
ters for selectively connecting said transmitters
able for transmission, contro1 apparatus for said
WALTER M. BACON.
- y
Документ
Категория
Без категории
Просмотров
0
Размер файла
2 149 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа