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Патент USA US2406787

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Sept° 3, 1946?
Filed April 7, 1945
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Patented Sept. 3, 1946
Walter M. Bacon, New York, N. Y., assignor to
Bell Telephone Laboratories, Incorporated, New
York, N. Y., a corporation of New York
Application April 7, 1943, Serial No. 482,075
8 Claims. (01. 1'78_—-3)
sion over the respective ‘transmission circuits ex
tending to the various stations of the system.
graph communication systems. » '
Two or more groups of storage repeaters are as
An object of this invention is to simplify and
sociated with each of the outgoing transmission
improve telegraph switching systems to make
circuits extending to a station associated with
each of theparty lines. Messages which are given
them capable of more expeditiously andpselec
tively' transmitting messages fromv one station to
another 'under control of directing or address
preference are directed to one group of ' storage
repeaters, while the other messages are directed
characters preceding the communications be
tween the various stations in which certain mes
sages are transmitted before other messages in
dependently of the stations to which the messages
are directed or alternatively messages to different
stations of the telegraph system are transmitted
before messages to other stations.
‘ Brie?y, in accordance with this invention, pro
vision has been made for the transmission of
certain telegraph messages through a telegraph
system before other messages are transmitted
through the‘system.
In one form, certain mes
sages for any station or receiving instrument vare
directed to storage repeaters for later transmis
This invention relates to telegraph systems and
more particularly to automatic switchingtele
to another group of storage repeaters. Control
equipment is provided in which transmission from
the storage repeaters is arranged so that trans
mission will proceed from the group of storage
repeaters to which the preferred messages are
.. directed as long as any messages are stored in
any of the group of storage repeaters handling
preferred messages. Messages will be transmitted
from other groups of storage repeaters handling
the other messages» only when no preferred mes
sages are awaiting transmission.
Features, principles, combinations and subcom
given preference over other messages for the same
station or- stations of the system and» are trans
mitted in preferenceto these other messages.
binations comprising the novel features of the
invention may be applied in variously modi?ed
vided for the transmission of messages to other
scription when read with reference to the a '
30 tached drawings, in which:
Alternatively, in accordance with the present 25 ' The foregoing and other objects and features
of this invention, the novel features of which are
, invention, provision is made for providing more
speci?cally set forth in the claims appended
rapid service for transmitting messages to pre
hereto, may be understood from the following de
determined stations of the system than is pro-.
In certain telegraph systems it is frequently de
sirable to insure that certain messages are all
transmitted before other messages are trans
Figs. 1A and 1B show the manner in which the
remaining ?gures of the drawings are positioned
adjacent each other to show a speci?c embodi
ment of the invention;
Figs. 2, 3 and 4 when‘ arranged as shown in
Furthermore, in systems in which a plurality of 35
Fig. 1B, show in diagrammatic form the various
stations are connected to a single channel or party
elements of a typical system incorporating the
line extending to the switching center, it is some
present invention; and
times desirable to provide equipment for having
Figs. 5 through 15 inclusive, show in detail
certain messages transmitted before other mes
arrangements of certain elements of a
sages are transmitted over the party line.
typical system incorporating the present inven
A feature of the invention comprises an ar
rangement whereby messages directed to one sta
Referring now to Figs. 2', 3 and 4 when ar
tion upon a multistation channel may receive
as‘ shown in Fig. 1A, Fig. 2 shows two
preference over messages directed to other sta- '
In the exemplary embodiment of the invention
described herein, the invention has been incor
porated in a comprehensive switching system of
the type described in the copending application
of Branson et al., Serial No. 448,878, ?led June .27,
1942,. In accordance with systems of that type,
a plurality of outlying or way stations are con
nected to a telegraph transmission channel ex
tending ,toza central exchange. At the central
exchange the messages are stored and selectively
typical party lines and the station and control
equipment associated therewith. One party line
is designated 2|!) which comprises a receiving
channel 2-H and a transmitting channel 2I2.
Similarly, party line 260 comprises a receiving
channel 26| and a transmitting channel 262.
Both transmitting and receiving channels are
illustrated in Fig. 2 and also in Fig. 3 by means
of telegraph lines or conductors. It is to be un
derstood, however, ‘that these lines or channels
may include any type of telegraph transmission
equipment normally employed for the transmis
sion of telegraph signaling pulses or code combi
nations of pulses, These lines or channels may,
for example, include open wire lines, cable lines,
channels of voice frequency or high frequency
carrier current systems, radio systems, time di
vision multiplex systems or telegraph channels
of composite telephone and telegraph transmis
sion systems or of any other type of pulse trans
mission channels including full-duplex and also
simplex channels, or systems suitable for the
transmission of signaling pulses such as employed
in telegraph systems. The various party lines
forator for again perforating tape in accordance
with messages received from the system. This
reperforator is provided at those stations at
which other telegraph lines or circuits may ter
tions connected to these other lines may ‘be re
corded at station 2l'8 and later automatically
transmitted over the proper line without requir
ing the time“ of an operator to retransmit the
10 message.
In order to transmit messages over this system,
the attendant or subscriber at the outlying or
way stations perforates messages in paper tapes
for later transmission over the system. Preced
and channels thereof may include or comprise
any or all of the foregoing types of transmission
systems or any or all combinations of such types
ing each message, an address or group of switch
ing signals is perforated in the tape and follow
of transmission systems.
The transmission systems of the various types
comprising the party lines operate in their usual
ing each message an end of message signal is
also perforated in the tape. Following the end
of message signal, a subscriber may perforate any
and well understood manner and the operation,
address signal followed by another message in
tended for the station designated by the address.
As set forth in the above-identi?ed application
therefore, need not be repeated because it would
serve no useful purpose and only tend to obscure
the other elements and features of the present
Each of the party lines shown in Fig. 2 extends
to a plurality of outlying subscriber or way sta
tions. It is to be understood also that it is with
in the scope of this invention to extend lines
individually from one or more of the outlying
stations to the central switching exchange, In
this case certain of the control equipment as
of Branson et al., the subscriber may insert one
or more letters signals at the beginning of the
tape, at the end of the tape, between messages
and at other desirable or convenient places be
tween the message codes, between certain of the
controlling codes, or between these codes and the
message codes. Furthermore, the operator or at
tendant will usually perforate an end of trans
mission signal in the tape after the disconnect
signal following the last message available for
sociated with each of the party lines need not
be provided as will be readily apparent to those
skilled in the art.
minate so that the messages intended for sta
The attendant or operator at the outlying sta
Each of the lines which extends to more than 35 tion will then insert a tape in the transmitter
one outlying station is provided with control
for transmission over the system. At a later time
equipment located at or near the outlying sta
the transmitter is started under the control of
tions of the party line. Control equipment may
an operator or switching circuits at the central
‘be provided which is individual to each of the
switching station. Thereafter the messages are
outlying or way stations in case the way sta-l
transmitted to the central switching station and
tions are rather widely separated or control
recorded thereat.
equipment may be provided common to a group
The circuits at the central switching station
of outlying stations which are located more close
are illustrated in Figs. 3 and 4. ‘Fig. 4 shows
ly together. In addition, certain of the control
equipment may be individual to certain outlying
stations, while other control equipment provided
the originating position at the central switching
l. equipment comprising a keyboard perforator 4| I,
for the same party line may be common to a
a monitoring instrument 4H1, a transmitter or
transmitting distributor M2, control relays M3 '
plurality of the outlying stations.
and a director circuit 4M. Fig. 4 also shows a
As shown in Fig. 2, three separate and distinct
miscellaneous intercept circuit 42'! which operates
sets of switching and controlling circuits, some 50 with a receiving reperforator 426 and a tape re
times referred to as a secondary switching center,
ceptacle 425. A wilful intercept circuit 424 is
are associated with each of the party lines. For
also shown. This intercept circuit is provided
example, party line 2E0 extends to the switching
with a repeating instrument 420 comprising a
and control circuits or secondary switching cen
ters 2l3, 2H! and 215.
recorder or reperforator 42! and a transmitting
The control equipment (i.. in device vll22.
214 is individual to a station at 2l>9. Control
equipment 2 l 5 is common to stations 2| 6, 2 l l and
2|8, while control equipment H3 is common to
stations 220 to 224 inclusive. Each of the out
lying stations is provided with a receiving in 60
strument, transmitting apparatus and control
equipment. In the speci?c system described
herein, the transmitting equipment comprises a
keyboard perforator for perforating paper tape
in accordance with the signals to be transmitted
and a tape controlled transmitter for transmit
ting signals in accordancewith the perforations
in the tape. For example, the receiving instru
ment and the keyboard perforator are illustrated
diagrammatically and designated 225 at station
2l6 of Fig. 2, the transmitting distributor is de
signated 235, while the control equipment is
designated 2%. Similar equipment is provided
at the other stations. Station 2! 9 is provided
with an additional receiving. recorder or reper
A director ‘423 is also associated with
the wilful intercept circuit.
Each of the party lines terminating at the
switching office or center is provided with an
incoming line circuit 322 and a receiving only
machine 323, a storage receiver 326 and associ
ated transmitter 325. The'incoming line circuit
322 causes the messages intended for, the cen
tral switching station to be recorded on the re
ceiving only receiver 323 and causes the mes
sages intended for other stations of the system
to be recorded by the reperforator 326. Director
circuit 321 is associated with the transmitter 325
and serves to direct messages from the transmit
ter 325 selectively to any of the lines terminat
ing at the central switching station under con
trol of the address characters preceding each
Each of the party lines is also provided with
transmitter start circuits, such for example as
3H), and outgoing line circuits and equipment
355 for transmitting messages over the partyv line.
The outgoing line circuit associated with party
line 2l0rand particularlythe receiving channel
2“ thereof, incorporates control circuits and
equipment in accordance with the present in~
portion of the system will not be repeated here.
It should be noted, however, that a single line is
shown in the. drawings extending from the trans
mitter 325 to the director circuit [£581. This
single line shown in the drawings is. intended
to represent the operative connections between
vention as will be described’ hereinafter. Brie?y,
transmitter 325. and director I'Eil'l and includes.
messages directed to stations of party line 2H3
as manywires or conductors‘ as are necessary
are. transmitted to storage repeaters of the out
to. control the operation of the system in the
going line circuit associated with line 2H) under
controlv of the director circuits of the linesupon 10 manner set forth in- the above-identi?ed copend
ing Branson et a1. application. I
which the messages originate for later transmis
Assume now for purposes of illustration. that it
sion over the outgoing lines.
is desired to give preference to messages directed
Figs. 2 and 3 also. show a trunk circuit 296.
to the receiving recorder or reperforator 2-29 at
comprising two transmission channels 29! and
292 extending to a distant switching center 295. 15 station 219. As will be readily apparent to those
skilled in the art, messages to other receiving
The terminal equipment associated with the
devices or other stations may also be given pref
trunk circuits is. similar to. the. terminal equip
erence over other messages. As indicated in the
ment associated. with each of the. party lines as
above-identi?ed copending application of Bran
described above.
son et a1., messages directed. to the recording
The operation of the various circuits referred
equipment 229 at'station 2li9 are preceded by
to above is described. in detail inv the above
either the address code BJ or BK. Any suitable
identi?ed copending patent application of Bran
address’ code. may be chosen to direct messages
son et'al. Since the respective circuits referred
to this recording equipment, but for the purposes
to above forming parts of the system referred to
of illustration the code letters BJ and BK were
herein operate insubstantially the same manner
assumed in the above-identi?ed copending ap
as described above in said patent application of
plication and will be likewise assumed herein.
Branson et al., which patent application is made
As pointed- out in the above-identi?ed copend
a, part hereof as if fully included herein, the
ing application, it is frequently desirable to re
detailed description need not be repeated here. .
transmit messages recorded by the recorder 229
Reference will now be made to Figs. 5 through
over other telegraph systems. For this reason,
15 inclusive, when arranged as shownv in Fig. 13.
it may be desirable to give these messages pref
Fig. 5 shows the subscribers’ stations and control
equipment associated. with party line 2.50. The
subscribers’ stations and control equipment ‘as
sociated with party line 219 are shown in sub
stantially the same form as shown in Fig. 2.
In addition, the same reference numerals have
erence over other messages transmitted. over the
ing at
any of
to the
described herein. The messages originat
any of the stations of party line "21-11 or
the other stations of the system directed
recording equipment 229 will be trans
been employed to designate the stations and
equipment. Details of typical party lines of this
type are described in the above copending ap
plication of Branson et a1. and also in apatent
application of Krecek ,et a1., Serial No. 408,406,
?led August 28, 1941, which applications are
mitted to the central switching station in the same
manner as the messagesdirected to other'stations
40 of thesystem. In transmitting these messages to
described above, incoming, messages intended for
switching station. The central ‘station incoming
line circuit together with the storage repeater
the central switching station, the attendants at
each of the outlying stations will perforate mes
sage signals preceded by the address codes in the
tape by means of the keyboard perforator at the
hereby made a part of this application as if
fully included herein. Inasmuch as the equip- , ‘r respective stations. The perforated tape is then
inserted in the tape controlled transmitter where
ment in the. circuits at the subscribers’ stations
it awaits transmission to the central switching
as well as the control circuits therefor operates
in substantially the same manner as described
Equipment at the central switching station
in the above-identi?ed copending applications,
detailed description of the operation of the cir 50 either automatic or under control of the start
keys 39!], causes the start circuit 3-H} to transmit
cuits will not be repeated here.
predetermined start signals or patterns of signals
Fig. 5 also shows transmitter start circuit 3H!
over the receiving channel 2H of party line 2m
as well as the incoming line circuit 322, storage
and causes the initiation of transmission selec
repeater 324 comprising a reperforating unit 32 6,
tively from the transmitters at the stations con
and a transmitting unit 325. Fig. 5 also shows
nected to the party line.
a receiving only machine 323 associated with
The messages are then transmitted over the
the incoming line circuit for receiving messages
transmitting channel, such as 2l2, to the central
intended for the central switching center. As
the central switching center are directed to the
receiving only machine 323, while messages in
tended for other stations of the system are re
corded by the receiving instrument 326 of the
storage instrument 324. The transmitting por
tion of the storage device 324 cooperates with
the director circuit [55! for selectively directing
messages to the proper lines in accordance with
'324 and receiving only device 323 cause ‘the sig
nals to be recorded either by the receiving only
device 323 or in the storage repeater 324 by re
cording equipment 326 thereof or by both devices
323 and 324, Thereafter the transmitting por
tion 325 of the storage repeater 324 will, in co
operation with the director circuit ISM, cause
the message to be transmitted to circuits asso
the address codes preceding each of the messages.
ciated with the proper party line extending to
The operation of the director circuit in directing
messages to the respective lines of the system 70 the stations designated by the address preceding
each message or communication.
under control of switching or directing charac~
ters preceding Various messages or communica
tions is substantially the same as described in
The operation of the equipment as well as the
more detailed‘description of the equipment are
set forth in the ‘above-identi?ed application of
the ‘above-identi?ed application of Branson et
a1. Consequentlmthe details of. operation of: this 75 Branson et a1. ,Since. the equipment of theeysys
tem described in this application operates in sub
MI 2 completes a circuit for the operation of relay
MI I. Relay MI I in turn operates and completes
a circuit for maintaining itself operated over lead
stantially the same manner as described in said
application of Branson et al., the description
thereof ,will not .be again repeated.
In directing messages to the respective out
Relay MII in operating also causes the
circuit to test busy should any other director
going line circuit, the director equipment I50I
circuit test this circuit preparatory to sending
?rst tests the outgoing line circuit equipment to
messages thereto.
determine whether or not it is busy. If the out
The operation of relay MI2 connects ground
going line equipment is busy, the director equip
to lead I520 extending to the director circuit
ment will wait until it becomes idle. If the 10 which in turn causes the message preceded by the
equipment is idle or some channel thereof is idle,
second of the address codes to be transmitted to
the director equipment will cause the message to
and recorded by the recording portion of the stor
be transmitted over the idle channel.
age repeater shown in Fig. 13. Under the assumed
Under the assumed condition, messages pre
condition the message will at this stage of trans
ceded by the address codes BJ and BK are given
mission be preceded by either a J or K designating
preference over other messages, messages pre
the recording equipment 229 at station 2 I0.
ceded by these address codes will be directed to
In a similar manner, messages preceded by
the storage repeating equipment shown in Fig. 13,
other of the address codes designating other sta
whereas, other messages directed to other sta
tions of the party line 2 I 0 will be directed to either
tions of the party line 2I0 will be directed to the
the storage repeater equipment shown in Fig. 8
storage equipment shown in either Fig. 8 or 9.
or that shown in Fig. 9 in a manner similar to
Consider ?rst the messages directed to the
that described above with reference to the di
storage repeater equipment shown in Fig. 13.
recting of a message to the recording equipment
When the messages are preceded by the address
shown in Fig. 13.
codes, either BJ or BK, director equipment I50I
In addition the messages directed to the other
will ?rst test the conductor MIO extending
stations of party line 2I0 will be directed alter
through the intercept circuit MM to determine
natively to the storage repeater shown in Figs. 8
whether or not the receiving side of the storage
and 9 due to the operation of relay I M5 in the
repeater shown in Fig. 13 is busy. If this equip
manner described in the above-identi?ed copend
ment is busy, nothing further will happen until
ing application of Branson et al. forming a part
the equipment becomes idle. At this time, the
of the present application. Various alarm and
director circuit will cause ground to be connected
other indications are provided for indicating the
to lead M I 9 which lead extends through the lower
condition of the system as described in the above
break contacts of relays MID, MI I and the upper
identi?ed copending application, which descrip
break contacts of relay MM over conductor MI3
tion need not be repeated here.
to the vertical magnet I5 I 2 of the cross bar switch
The storage equipment shown in Figs. 8, 9 and
diagrammatically illustrated in Fig. 15. The
I 13 comprises recording instruments 806, 900 and
horizontal magnet I503 of the cross bar switch
I306 respectively. These equipments are driven
was previously operated under control of the
by their respective motors 80I, 90I and I30l and
sequence circuit I502 and director circuit I 50I 40 record messages under control of the respective
in a manner similar to that described in the
selector magnets 825, 025 and I325 and cause the
above-identi?edcopending application of Branson
messages to be both printed upon‘ and perforated
et al. The operation of the vertical or hold
or punched in respective tapes 830, 930 and I330.
magnet I5I2, when magnet I503 is also operated,
When message material is stored by these receiv
causes the contacts at the cross-point to be op
' ing devices or storage devices, it will cause the
erated and also completes a circuit over lead
respective transmitting heads 801, 001 and I307 to
MI5 for operating relay I 43I from battery
rotate in a counter-clockwise direction and thus
through the Winding of relay I 43I, the lower
cause the respective contacts 82I, 92I and I32I
break contacts of relay MM and lead I4I5 to
to close.
ground through the operated contacts of magnet
Assuming now for purposes of illustration that
I5I2. A typical cross bar switch of the type
message material has been supplied to each of
shown in the drawings is described in greater
the storage repeaters shown in Figs. 8, 9 and 13,
detail in United States Patent 2,021,329 granted to
and that this message material is transmitted to
Reynolds on November 19, 1935, which patent is
these repeaters substantially simultaneously so
hereby made a part of this application as if fully 55 that the contacts 82I, MI and I32I are all closed
included herein.
substantially simultaneously. The closure of con
Relay M3I in operating connects ground to lead
tacts 82I completes a circuit for the operation of
I4I6 extending through the operated cross-point
relay ‘H0 from battery through the winding of re
contacts of the cross bar switch to the director
lay ‘IIO, the second set of normal contacts from
circuit I50I. The director circuit then completes 60 the top of relays 6I0 and (H9 to ground through
a circuit for the operation of relay MM. Relay
the operated contact 02L Likewise closure con
MM in operating applies ground to lead MI3
tact 02I completes a circuit for the operation of
for holding magnet I5I2 operated. Relay MM in
relay ‘H9 due to the current ?owing through a
operating also transfers the circuit of the winding
similar circuit to ground through the closed con
of relay I43I to lead I M9 extending to the di
tact 92L It is assumed that relays 6I9, BIO and
rector circuit. When the director circuit removes
SH are all normal or released at this time. In
ground from lead MI9, relay M3I releases and
other words, none of the stop keys associated with
prepares a circuit for the operation of relay MI2
the transmitting portions of the storage repeaters
from battery through the winding of relay MI2,
shown in Figs. 8 and 9 have been operated and
lower break contacts‘of relay M3I, over lead I4I6 70 also that the transmitter start circuit 3I0 is not
to the director circuit. The director circuit to
in the progress of transmitting a series of start
gether with the release of relay I 43I will cause
signals or patterns, or starting transmission from
relay MI2 to operate and condition the receiving
any of the stations of the party line.
portion of the storage repeater shown in Fig. 13
If the transmitter start circuit is in the progress
for operation. In addition, the operation of relay 75 of transmitting signals to cause the. testing of
,any of the transmitters for storage message ma
permitting these contacts to transmit codes stored
terial. available for transmission, relay .3 I9 will'be
in tape I330. Relay I.20.I in operating also com
pletes a circuit for the operation of magnet I3“
circuit of relays H0 and ‘H9.
in a circuit extending from battery through the
winding of relay HI I, lower break contacts of
relays I2I0 and I206, the fourth set of operated
contacts from the top of relay I'20I, the lower
break contacts of relays I2“ and I2I2 to ground
operated, which relay interrupts the operatlng
These relays will ‘
‘not, therefore, operateat this time but will wait
until relay .6 I 9 is released at the endrof the trans
mission of the transmitter star-t circuit by the
transmitter start circuit 3 I 0.
'If either of the stop keys has been operated,
either relay M0 or 6“ will be operated and will
prevent the operation of the corresponding relay
‘III! or ‘II9. Assuming, however, that both relays
‘I I0 and 'I I9 operate at this time, the operation of
relay ‘H0 completes the circuit for the operation
of relay ‘H3 from battery through the winding of
relay ‘II 3, through the lower inner break contacts
of relay 6.01, the lower operated .contacts'of relay
‘H0 and the lower break contacts of relay H5 to
ground through the second set of normal con
tacts from the bottom of relay .609 and the break
contacts of relay 602.
The operation of relay ‘II9 completes a similar
circuit for the operation of relay ‘I22 from battery
through the winding of relay ‘I22, the upper inner
break contacts of relay 6.01, the lower outer op
erated contacts of relay _-'II9, and the lower'break
contacts of relay ‘I24 to ground through the'third
set of normal contacts from, the toprof relay 60:9
and the break contacts of relay 7603. The opera
through the closed contacts I32 I..
Magnet I3II attracts its armature andreleases
the sensing and transfer portion of the transmit
ter shown in Fig. 13. This mechanism in turn
‘causes the transmitting distributor cam shaft
controlled by magnet I341 to be released at a
short interval of time later after the members
I309 have positioned the contacts controlled by
them in accordance with the perforations in tape
I339. Thereafter the signals stored in tape I330
are transmitted over the receiving channel v2II
of party line H0 in a normal manner. Under
the conditions assumed ‘above the letter J or K
will precede. the message. When the letter J or
K which precedes the message .is received by con
trol equipment at each of the respective control
centers ‘2L3, 2M and 7.2!5, these control centers
will respond to this character and cause the
transmission circuit. to be selectively extended
.from the receiVing'channeLZII to the receiving
instrument 229 at station 2 I9.
As will be readily understood by those skilled
tion of either or both relays ‘I I :3and ‘I22 completes 30
in the art, if a di?erent address signal had pre
a circuit for the voperation-of relay 601 from ibat
ceded the message it wouldv usually but not neces
tery through the winding of relay ‘601 to ground,
sarily be directed to a different receiving in
through the upper outer operated contacts of
Thereafter, the receiving instrument
either or both relays ‘H3 and ‘I22. Relay Bil‘! in
operating interrupts the operating circuits of re 35 to which this message is directed will receive
and record the succeeding, message signals.
lays ‘I I3 and ‘I22. However, the operation of relay
under the assumed conditions only
B0‘! ?rst completes a circuit .for maintainingrelay
those messages'directed to preferred stations will
1I3 operated from battery, through “the winding
be transmitted to the storage equipment in Fig.
and the upper operatedcontacts of relay .‘II3, the
second set of operated contacts from the top and 40 13 as pointed out above and consequently the
messages transmitted from this storage equip
bottom of relay 601 to ground through the break
7 contacts of relay 602.
Inasmuch as both relays‘II3 and 122 have been
operated, relay ‘"3 will lock operated while relay
ment by means of the associated transmitter will
be transmitted ‘to only the preferred stations.
During the-transmission of the message all the .
usual code combinations‘may be transmitted in a
‘I22 will release due to the fact that both its op
erating circuit and locking circuit .are interrupted.
normal manner over the .outgoing channel which
The operating circuit of relay ‘I2! is interrupted
by_the operation of relay 607 and its locking ‘cir
cult is interrupted by the operation of‘relay ‘I I 3.
None of the switching circuits ‘will respond to
a The release of relay 122-.completes the circuit ‘
for the operation of re1ay'606 which relay'in op
eratmg prepares a circuit for the operation of
relay BIZ.
Similarly, the operation of relay I 204 in're
extends to the connected receiving instrument.
any of these signals excepting'the ?gures sig
nals. When the ?gures signal is transmitted
over .theoutgoing channel a circuit is completed
for the operation of relay I208 from battery
through the upper winding of relay I298, con
' ductor vI33£I to ground through the contacts :con
trolled by members I399 when they are positioned
in accordance with the ‘?gures signal. If the
succeeding signal'combination is any ‘code com
bination other than that representing another
?gures or H signal, relay I208 will release when
" ating circuit is interrupted at the lower operated 60 the members I309 position the contacts ‘controlled
by them in accordance with any code combination
contacts of relay I204. Relay I ZIlI, however,
other than the code combinations representing
operates at this time in a circuit extending from
the ?gures signals or H signal. Thereafter cir
battery through the winding of relay I20I, the
cuits are maintained in the condition described
upper operated contacts of relay I 209, the lower
above until the ?gures signal is immediately fol
outer break contacts of relays 6I3 and (H2, the
lowed by an H signal.
upper break contacts of relay I201 to ground
During the transmission of the ?gures signal
through theoperated contacts‘ of relay I204. Re
members I303 are positioned in accordance with
lay I20I in operating completes a circuit for
the ?gures signal and complete a circuit for the
maintaining itself operated under control of relay
I209 in a circuit from battery through the wind 70 operation of relay I208 as described above.
When the immediately following signal is an H
ing and upper inner operated contacts of relay
7 signal, members I309 will be positioned in ac
I20I to ground through the lower operated con
cordance with the H signal immediately after
tacts of relay I209. Relay I20I in operating re
sponse to the operation of contacts I32I prepares ‘
a circuit for the operation of relay I20I. Relays
I 20I and (H2 however do not both operate at
this time.
Relay BIZ does not operate because its oper
they have been positioned in accordance with the
moves the short ‘circuit from around the code
contacts of the distributor shown in Fig. 13 thus 75 ?gures signal. Under these conditions a circuit
will be completed for holding relay I208 operated
The operation of relay I20I again conditions the
equipment for transmitting the succeeding mes
and for the operation of relay I205. , These. cir
cuits extend from battery through the winding
sage stored in tape I330. This message is trans
mitted over the party line 2I0 extending ,to the
of relay i205 and the upper operated contacts
of relay 5 208 and from battery through the lower
winding of relay I208 and then in parallel
through the lower operated contacts of relays
I208 and I20I over lead I335 to ground to the
receiving instrument designated by the codes pre
ceding the subject-matter of the message.
The circuits respond during the transmission
contacts controlled by members I309 when these
this message in the same manner as described
of this message and to the address code preceding
members are positioned in accordance with a 10 above. .If at any time it is desired to transmit
code combination representing the letter H. Re
lay I205 in operating completes a circuit for
maintaining itself and relay I208 operated under
contro1 of relay I20I. The circuit for maintain
ing these relays operated extends from ground
through the lower inner operated contacts of
relay I20Iand the upper operated contacts of
relay I205 to battery through the winding of
relay I205 and also through the upper operated
contacts and lower winding of'relay I208 to bat 20
tery. During the sensing and transferring of
the next code combination stored in tape I330,
transmitter start signals from the transmitter
start circuit 3I0 over the receiving channel 2II
of the party line ‘2I0, as described in the above
identi?ed application of Branson et al., relay
i2I I will be operated and interrupt the operating
circuit of magnet I3II thus interrupting the
transmission from the transmitting equipment
shown in Fig. 13 at the end of the code combina
tion in the progress of being transmitted. At the
completion of the transmission of the transmitter
start signals, relay 12“ will be released and the
transmission of the message stored in tape I330
contacts I3I'I will momentarily close and com
will be resumed.
plete a circuit for the operation of relay I206.
During the operation of the transmitter start
circuit, under the assumed conditions, the last
one of the transmitters shown in, Figs. 8 and 9
Contacts I3I'l momentarily close during the
transmission of each character by the transmit
ter associated with the storage equipment shown
in Fig. 13. However, the circuit from these con
tacts is not completed except in the case of a
?gures signal and an H signal being transmitted _
immediately preceding the transmission of the
code combination in question.
While the code combination following the ?g
ures signal and the H signal will normally be a
letters signal, it does not necessarily have to be
this code combination but may be any other suit
able code combination.
The closing contacts I3I'! complete a circuit for
which previously transmitted over the receiving
channel 3“ of party line 2I0 will, be employed
for the transmission of the signals fromthetrans
mitter start circuit in a manner similar to that
described in the above application of Branson
et al.
Under certain circumstances it may be desir
able to prevent the operation of the transmitter
start circuit 3 I 0 during the transmission of urgent
messages over the receiving channel of party line
H0 or during the time that urgent messages are
awaiting transmission over the receiving chan
the operation of relay I206 from battery through
nel 2| I. In order to preventthe operation of the
the winding of relay I200 and the lower operated Lil) transmitter start circuit 3I0 at this time, key
contacts of relay I205 to ground through the op~
I340 has been provided. When key i340 is op
erated contacts of relay I3I'I.
erated and relay I204 also is operated due to the
The operation of relay I206 interrupts the op
presence of storage material in tape I 330 avail
erating circuit magnet I.3I I and thus permits this
able for transmission over party line 2H3, ground
magnet to release and stop the transmitting por
will be connected to a lead extending to the trans
tion of the storing equipment shown in Fig. 13
mitter start circuit 3 I 0. Ground is also connected
at the end of the transmission of the code com
to the same lead to transmitter start circuit by
bination immediately following the ?gures and
incoming line circuit 322 andrthus indicating a
H code combinations as described above. The op
eration of relay.l206 also completes a circuit for
busy condition of the'incoming line circuitand
maintaining itself operated under the control of
relay I 20I from battery through the winding and
upper inner operated contacts of relay I 206 to
ground through the lower inner operated contacts
of relay I20I. The operation of relay 1206 also r
interrupts the operating circuit of relay I209,
preventing the operation of the transmitter start
circuit 3I0 at this time. Thus, with key I340
closed and relay I 204 operated, the transmitter
start circuit 3“) will not be set into operation by
the incoming line circuit at the end of the trans
mission from the transmitter then in the progress
of transmitting a message from any one of the
thus permitting relay I209 to release. Relay I209,
transmitters associated with the party line to the
however, is slow in releasing and does not release
until after the third, code combination referred
to above has been fully transmitted.
After ample time has been provided for the
complete transmission of this code combination,
relay I203 will release and interrupt both the op
erating and locking circuits of relay I20I. Re
lay I20I will release and short-circuit the trans
mitting or code combination contacts which pre
vents further transmission at this time.
central switching station.
Assume now that the transmitting equipment
Assuming that at least a portion of a second
(l G
shown in Fig. 13 is approaching the end of the
last message stored in tape I330. The transmit
ting head I301 rotates in a clockwise direction at
this time and causes the transmission of the ?rst
?gures signal, which signal causes the operation
of relay I208 as described above. The transmis
sion equipment shown in Fig. 13 will then cause
the transmission of the following H signal which
signal causes relay I205 to operate and maintains
message is awaiting transmission from tape 1330,
Under these conditions, contacts i320 will not
relay I208 operated. Relay I205, when operated,
open so relay I204 will remain operated.
relay I208 operated under control of relay I20I.
The transmitting equipment shown in Fig. 13
will then start to transmit the following letters
I204 in remaining operated prevents the opera
tion of relay 3 I2 as described above. Under these
conditions, relay I20I will again operate upon
release of relay I209 in a circuit described‘ above.
completes a circuit for maintaining itself and
signals. , During the first portion of the revolu~
tion of the transfer shaft and mechanisms, trans
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