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Патент USA US2403681

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L‘ M, Fons
‘Filed Sept. 18, 1944__
2 Sheets-Sheet 1
FIG. -I 1
Juli’ 9,1946-
1_. M. POTTS
Filed sept- 18, 1944
FIG- 2 I
2 Sheets-Sheet 2
Patented July 9, 1946
Louis M. Potts, Evanston, Ill., assignor to Tele
type Corporation, Chicago, Ill., a corporation of
‘Original application October 19, 1942, Serial No.
462,523. Divided and this application Septem
ber 18, 1944, Serial No. 554,636
3 Claims. ' (01. 178—71)
This invention pertains to printing telegraph
systems and particularly to a system for the trans
are employed for transmitting purposes instead
of a double wound relay.
mission and reception of secret telegraph mes- '
In order to .encipher messages ‘by the present
,system the elements of the original code combi
nations are combined'with thev elements of code
combinations provided by a key tape. In this
This application is a division of copending ap- .
plication Serial No.'462,523, ?led October 19, 1942.
Secret signaling systems are desirable for naval,
military and civil purposes wherein it is re
arrangement, opposite conditions, that is, with
one element of the original code combination
quired that messages be rendered uninterceptible
marking and with the corresponding element of
by persons unauthorized to receive them. The 10 the key code combination spacing, produce a
surreptitious interception of messages may be ac
complished, for example, in the case of wire com
marking signal. Like condtions, however, that
is, With-both elements marking or both elements
spacing, produce spacing signals. This presumes,
of course,'that each of theelements of the re
munication by tapping signal wires and in radio
communication by means of receiving/appara
tuses tuned to the proper frequencies.
spective code combinations are related to each
other. That is, the No. 1 element of the original
code combination is combined with the No.’ 1
The primary object of the present invention is
the provision of a reliable and practical telegraph
circuit arrangement for rendering messages unin
element of the key code combination, and ‘so
forth. To take a speci?c illustration, let it be
Another object of the present invention is the 20 assumed that it is desired to encipher the letter
provision of a ciphering system for telegraph
“R.” which in the Baudot code is composed con-v
telligible to unauthorized persons.
messages including an electrical circuit system
which is automatically conditioned either to en
cipher or decipher signals according to the direc
tion of transmission.
secutively of spacing, marking, spacing, marking,
and spacing conditions.
Let it be further as
. sumed that‘the key tape with which the particua
25 lar enciphering operation is to be performed 00-.
A further object of the invention is to provide
a portable self-contained’ enciphering and de
cupies a position whereat itis conditioned for
producing the letter “Y” combination which in
ciphering unit that is easily and readily attach
the‘Baudot code is composed consecutively of’
marking, spacing, marking, spacing, and marking
ing apparatus having transmitting and receiving 30 conditions. Under the assumed conditions, the
enciphering operation would result in the produc;
able and detachable to standard telegraph print- '
.In one form, the invention utilizes .a receiving
distributor by means of which a set of five re
tion of an all marking or “letters” combination
since in this particular illustration opposite condi
ceiving relays are conditioned upon the receipt
tions of all the elements of “R‘” and “Y’f code
of enciphered or deciphered'signals and a key' 35 combinations are provided. This will be readily
tape transmitter for providing key signals. The
apparent from the following chart wherein the let
key signals are combined with the signals provided
ter “M” indicates a marking condition and the
by the receiving relay and produce resultant sig
letter “S’f indicates a spacing condition.
nals which are transmitted by means ‘of a trans
mitter-distributor to a transmitting relay having 40
a pair of associated transmitting contacts, only
one of which is e?ective for, transmission at a time
dependent ‘on the direction of transmission.
A second form of the invention features the
use of a double wound relay for enciphering and
Original signal
Key signal “Y" ____________ __
Enciphered signal “letters"_ _ __
s \
deciphering messages. One Winding of the relay
It is understood that both the transmitting
is under the control of key signals and the other
and receiving end of a telegraph line will be
winding is under the control of either enciphered.
equipped with identical key tapes, which'during
or original signals dependentupon the direction
message transmission will occupy identical posi
of transmission. In this instance, two distribu 50 tions. The key tapes are advanced during trans
tors are provided, one for key signals and the ' ' mission to continuously modify the key signal,
other for either the original or enciphered sig
A’ third form of the invention‘ closely resembles,
but both tapes occupy the same corresponding
position at all times. A station which receives en
vciphered signals is thus enabled to decipher the I
the second form except that two separaterelays 55, unintelligible signals transmitted over the tele
tion unit II at this time, and the distributor is
above in connection with the enciphering opera
tion will be continued and it will be assumed that
a receiving station received the enciphered signal;
brought to rest upon the impression of the stop
or marking impulse upon magnet 44, which fol
lows after every ?ve-unit code combination. In
the rest position of the distributor 45, a circuit is
namely, “letters.” The “Y” combination provided
by the key tape at the receiving station can now
be combined with the “letters” combination to de
cipher the enciphered signals to thereby reproe
fore-break contact 48 to ground. The operation
of start magnet 44 releases distributor 45 for the
reception of a signal code combination from sta
graph line by combining enciphered signals with
key signals provided by its key tape. 'I‘o illus
trate a deciphering operation, the example given
made for relay 5| which may be traced as fol
duce the original signal “R” as clearly shown in
the following chart:
lows: From battery 52, through the winding of
relay 5i, over conductor 53, through segment 54
of the distributor, over the brushes 55, and
through conducting ring 56 to ground. As
brush 55 moves off segment 54, the circuit for re
lay 55 is broken, whereupon armature 51 is re
leased to open contact 49 to break the energiz
ing circuit of start magnet 44, and moreover,
direction relay 39 becomes locked up over the
following circuit: From. battery 35, through con
tact tongue 35 of direction relay 3?, over con
The invention may be more readily understood
from the following detailed description and the
drawings wherein,
Fig. 1 is a circuit diagram of the main embodi
ment of the invention;
Fig. 2 is a circuit diagram of a second form of
the invention;
Fig. 3 is a circuit diagram of a third form of
the invention; and
Figs. 4 and 5 are schematic views showing meth
ods of interconnecting communicating stations.
Referring now to Fig. 1, the ?rst form of the
invention will be described in detail. In order to
facilitate the description of the ?rst embodiment
of the invention, it will be assumed that a local
station comprising unit i l desires to communicate
with an outlying station over a loop circuit indi-
cated at 12.
In order to make a local record and
check the operation of enciphered signals, a check
printer I3 is provided which, by means of the plug
and jack arrangement shown at 14, may be read
ily plugged into the loop circuit. Similar plug
and jack connections for the station unit I l and
the loop l2 are shown respectively at l5 and 15.
The apparatus is provided with a manually-oper
ductor 33, through the winding of direction relay
39 (now energized), through its associated con
tact tongue 6|, over conductors 52 and 63,
[through contact tongue 51 of relay 5| (now de
energized) and through contact 58 of the make
before-break contact 48 to ground.
With direction relay 39 thus energized, its con
tact tongue 84 is held attracted so that transmit
ting contact 25 or‘ transmitting relay
is shunted
out of circuit ever conductors 21 and 66 inasmuch
* as at tlfis time it is desired to transmit from sta
tion l I to the remote station over the transmit
ting contact iil. This prevents the operation of
contact 25 from interfering with the operation of
the circuit under the ?rst assumed condition
with station H transmitting, At this time, the
direction relay 39 also» holds its associated tongue
E8 in its attracted position so that contact tongue
13 associated with relay ‘H is shunted out of cir
an cult and rendered ine?ective, in view of the fact
that it is necessary at this time that outgoing sig
nals which are transmitted through the relay "H
do not interfere with the operation of the circuit.
This shunting circuit is as follows: From contact
tongue 58, over conductor ‘I2, through contact
able switch shown generally at IT, by means of i
which the local station unit ll may be condi
' tongue 13 (if it should be attracted by its asso
tioned to transmit and receive either regular
ciated receiving relay 1 I) over conductor 14, over
telegraph messages or enciphered messages.
conductor 15, and over conductor '16 back to the
When it is desired to transmit or receive en
contact tongue 68.
ciphered messages, switch I1 is operated to its
The operation of direction relay 39 further
upper or coding position, and conversely, when
results in the attraction of its contact tongue
it is desired to transmit or receive regular tele
1'! to deprive direction relay 3'! of battery so
graph messages, switch i1 is positioned to its
that the local station unit Il may assume com
lower position.
plete control of the circuit, and therefore sig
The circuit for .the local station unit H may
be traced as follows: From battery l8 through
the winding of receiving relay 22, over conduc
nals from a remote station at this time will be
transmit, the just-described circuit is interrupted
station unit H by the local relay 22, contact
ineffectual to seize control of the circuit. After
every revolution of the distributor 45, brushes
tors 23 and 24, through contact tongue 25 of
55 return to their rest position whereat the
transmitting relay 2%, over conductors 21 and 28,
previously described circuit is made to the re
through tongue 29 of switch l1, over conductor
lay 5| which by its operation attracts its tongue
31, through the station H, back over the con (5O 51 to break the locking circuit to relay as to
through tongue 33 of switch l1, ‘and
return the circuit to normal in preparation for
subsequent operations.
over conductor 34 to ground:
When local station unit If commences to
As the original signals are received from
and relay 22 is de-energized due to the transmis 65 tongue 3! is operable to make and break the
sion of the start or no current signal. When
following circuit, according to whether mark
this occurs, the following circuit is established:
ing or spacing impulses are being transmitted:
From battery 35, over tongue 36 of direction re
From battery 82 through the windings of the
lay 31, over conductor 33, through the winding
receiving relays 83' (receiving marking signals),
of direction relay‘ 39, over conductor 4|, through 70 over conductors 84 to ,88, dependent upon the
contact tongue 42 of receiving relay 22 (now de
code combination being transmitted, through
energized), over conductor 43, over conductor 46,
associated segments 89, over brushes 9|, over
through the winding of start magnet 44 asso
the solid conducting ring 92, over conductors
ciated with receiving distributor 45, over cone
75 93 and T2, through contact tongue '68 (now at
ductor lil, and through contact 49 of make-be
tracted) of direction relay 39, over conductors
‘16 and 95 and through the contact tongue 8|
of local receiving relay’ 22 (when marking ‘sig
nalsare being received and receiving, relay 22
is accordingly energized) to ground.
. When a particular receiving relay 83 becomes
ductor I 23, through the solid conducting ring
I24 of ‘the transmitter distributor II 3, through
brushes I56 and segments “1, over a particular
‘ conductor. I55 conditioned for operation through
a tape feeler contact tongue I22', over either the
conductor I26 or I21, and through a contact
energized over the just-described circuit, it is
tongue I 2I to ground.
locked up as follows: From battery 82, through
In order to provide for the previously men'
the winding of a particularrrelay '83, over its
tioned overlap condition, the lower two receiv
contact tongue 96, over conductor 91, and 10 ing relays 83 will cooperate by means of their
through contact 98 of locking relay 99 to
tongues I2I with the lower two tape feeler con
ground. Prior to the reception of each signal
tact tongues I22 in a slightly different manner.
code ‘combination, locking relay 99 is momen
When either of the lower two tape feeler con
tarily energized to break previous locking cir
tact tongues I 22 move to their lower, or marking
cuits, which may have been completed over the 15 position, upon the sensing of a perforation in
following circuit: From battery IOI, through
the key type,v a circuit is completed upon the
the winding of locking relay 99, over conductor
operation'of overlap control relay I4I. Only the
I02, through segment I03 of the distributor 45,
over the brushes 55, and through the solid con
operation of the lowermost overlap relay I3I
will be‘ described. The circuit is as follows:
20 From battery I32, through the winding of relaxr
In’ order to effect the enciphering of out
I3I, over conductor I42, through feeler contact
going messages and the deciphering of incom- ,
I22, over conductor I44, through contact tongue
ing messages, there, is provided in the cipher
I45 of overlap control relay I4I (when operated)
ducting ring 56 to ground. '
ing system of the present invention, a key tape
transmitter indicated generally at III which
utilizes a key tape H2‘. It will be understood,
of course, that each station will be provided
with identical key tapes which occupy identi
cal positions during communicating operations.
Theonly prerequisite is that at any particular .
instant or communicating operation, the key
tapes at the interconnected stations be identi
cal, because the key tapes may be different at
ciphered or deciphered signals dependent upon
to ground.
When contact tongue ' I45 is at
tracted by overlap control relay I4I,' as will be
later explained, make-before-break contact I46
will be operated to break a previous locking cir
‘cuit for either of the overlap relays I3I if they
have been previously energized in a preceding
signal code combination. This locking circuit
extends from battery I32, through the Winding
of relay I3I, over contact tongue I5I, conductor
I52, and through make-before-break contact
‘M5 to ground. It is thus apparent that if in the
immediately preceding signal combination lower
the direction of transmission, are delivered to
tape feelers I2'2 were in their spacing positions
the transmitting relay 26 through the instru
their associated overlap relays I3I would not have
mentality of a transmitting distributor II3.
been operated, and. consequently, although
Shortly after the operation of» the receiving
‘tongue I45 will operate; it will not unlock any
distributor 45,'segment II4 thereof is traversed 40 circuit inasmuch as there was no circuit pre
by the brush 55 and a circuit is completed to
viously prepared for the relays I3I. The oper
the start magnet II5 of the transmitting dis
' ation of tongue I45 also performs the function
tributor I I3 from‘ ground, through solid con
of providing ground over conductor I44, through
ducting'ring 56, over brushes 55, through seg
the windings of relay I3I if they are prepared by
ment I I4, through the winding of start mag
a marking condition‘ of feelers I22 for a marking
operation in the next position of key tape II2.
place transmitting distributor H3 in operation.
Overlap control relay MI is momentarily ener
It' is, therefore, observable that the transmit
gized at each cycle of operation of distributor 45
ting distributor II 3 lags behind ‘receiving dis
prior to the transmission of the signal code com
tributor 45, the purpose of which is to provide 50 bination over the following circuit: From battery
an overlap arrangement to secure the proper
I41, through the winding of relay I4I, over con
margin of operating time for the ciphering op
ductor I53, throughvthe contact segment I 54 of
eration, to insure that the receiving relays 83
distributor 45, over conductor ring 56, to ground.
net II5, and through battery I I0 to ground, to
and the key tape II2 are properly conditioned
accordance with the combined positions of
for operation at the required time interval.
55 In
tongues I33 of overlap relays I3I and the tongues
As the receiving relays 83 respond to signals,
I2I of the lower two receiving relays 83, ground
associated tongues or armatures I2I are either
attracted or not, depending upon whether a
marking or a, spacing signal is impressed on stor
I may be furnished when marking conditions occur
over either conductor I34 or I35, through the
contact tongue I33, over conductor I55, through
ing relays 83. The circuit for the upper three
brush I 56, over the solid conducting ring I24 and
receiving relays 83 is so designed with respect
conductor I23, through the winding of trans
to the upper three tape feelers I22 of key tape
mitting relay 26 to battery I I6.
I I 2 that a marking signal will be produced when
During each revolution of distributor 45, step‘
the tongues I2I of the relays 83 are conditioned
to a position opposite to that of the correspond 65 ping, magnet I29 is operated to step the key tape
to a new position as stepping control relay I30 is
ing tape feelers I22. On the other hand, when
momentarily energized over the following circuit:
a particular contact tongue I2‘I moves to a posi
From battery, through the winding of relay I36,
tion similar to the position assumed by its asso
over conductor I40, through brushes 55 and over
ciated tape feeler I22, the circuit is conditioned
.to produce a spacing signal; therefore, when 70 the solid conducting ring 56 to ground. Relay I 39
attracts and then releases its tongue I56 to con
contact tongue I2I and tape feelers I22 are both
trol an obvious stepping circuit to stepping mag
marking or both spacing, a'spacing signal will
be sent. The circuits for marking signals may
net I26. Due to the overlap feature which has
be traced as follows: From battery I I6, through
been described,the stepping magnet is operated
‘the winding 'of transmitting relay 26, over con 75 while the fourth and ?fth signals are being trans
mitted since overlap relays l3 rare locked up and
retain the fourth and ?fth elements of the signal
code of the previous code combination when these
elements are conditioned for marking impulses by
the key tape I 12. When spacing signals are pro
vided in the fourth and ?fth elements of ‘a key
tongue I63 of receiving relay 1| (now de-ener
gized) , over conductor 46, through the winding of
start magnet 44 of the receiving distributor 45,
over conductor 41, through the make-before
break contact 48 associated with relay 5!, to
ground. Therefore, at this time, the distributor
45 is released for a cycle of operation through the
code combination by the key tape, tongues I33
operation of start magnet M ‘and the direction
of the overlap relays [3! will remain unattracted
relay H is energized and becomes locked up over
in spacing position.
following circuit after brush 55 [passes off of
As relay 2%) is affected by the enciphered sig 10 the
segment 5:! to cause the de-energi'zation of relay
nals, its contact tongue 6‘! is opened and closed
5!: From battery 35, through tongue 11 of direc
according to the signals that are being trans
tion relay 39, over conductor Iii-1, through the
mitted to the remote station. The signals trans
winding of direction relay 31, through contact
mitted, are, of course, start-stop code signals.
The key signals (that is, the signals controlled ‘ tongue [l2 (now attracted), over conductors 62
and '63, through tongue 51 of locking relay 5| and
by the key tape) are provided only for the code
through make-before-break contact 48 to ground.
impulses and not for the start and stop impulses,
The attraction of tongue 35 by the direction re
the latter impulses being invariable and are sup
lay 31 vbreaks the possible operating circuit for
plied independently of the key tape by the ‘dis
direction relay 39 so that again it is apparent that
tributor segments H8 and N9 of the distributor
the station which ?rst seizes control of the sys
H3. Since the normal stop condition of the line
tem prevents the other station from ‘operating
is marking, the stop impulse impressed on the line
during a signal code combination.
is controlled by the energized relay 26, whose cir
When direction relay 31 operates, contact
cuit under this condition extends from battery
H3 associated therewith is attracted so
H8, through the winding of relay 26, over con- 25 tongue
that contact tongue 61 of transmitting relay 26
ductor I23, over solid ring I24, over brushes I56,
is short-circuited in order to suppress interfer
and through stop segment MB to ground. Then
ence by this contact with the circuit ‘at this time.
upon initiation of transmission, when start mag
This circuit is as follows: From ground, through
net I I5 is energized and brushes I56 are caused to
contact tongue I13 of relay 3?, over conductors
traverse the segments; the traversal oi brushes
H4 and £59, through contact tongue 61 to ground.
E56 over the start segment H9 will produce a no
It is thus obvious that when the contact tongue
current condition on the line, since no battery is
61 operates inasmuch as it is directly grounded,
connected to the start segment H9. Hence, the
it will not cause the repetition of signals at this
circuit previously traced for relay 2%; will be
broken, and relay 2% will become de-energized to
Operation of direction relay 3? further causes
release its armatures 6i and 25 to transmit start
the attraction of its associated contact tongue
impulses, either‘ to the line 12 or to the local unit
H5, and ground for the storing relays is fur
H, depending upon the short circuit condition
nished over the following circuit: From battery
of said contacts 61 and 25, as previously described.
82 to a particular receiving relay 83, over one of
This causes the opening and closing of 100p cir
the conductors Bil to 38, through its associated
cuit l2 to operate a printer at the remote station.
contact segment 89, over brushes 9!, through the
This circuit is traceable as follows: From ground,
solid conducting ring 92, over conductor 93,
through transmitting tongue 61, over conductor
throughcontact tongue 13 of relay ‘H, overcon
I59, through the winding of relay ‘H, over con
du'ctor "ii-i, through contact tongue H5 (now at
ductor I51, through the lower switch tongue 158
of direction relay 31, to ‘ground.
of switch ll, over conductor I58, through the
Distributors 45 and H3 will act in the same
plug and jack connection it, through the out
manner aswhen signals were being sent out or
going part of the loop to the remote station, back
transmitted, to now decipher the incoming sig
through the plug connection [6, through the
nals to cause the deciphered signals to ‘be re
plug connection [4 of the check printer 13, over 50 peated by the transmitting relay 25. It will be
conductor ltl, through switch tongue Hill of
remembered that contact tongue 61' of transmit
switch i1, and over conductor “32 to- battery I49.
ting relay 26 is now short-circuit-ed and rendered
The encip-hered signals which will be printed by
ineffective for transmission. However, at this
the check printer l3 are also transmitted over the
time, transmitting contact tongue 25 is condi
outgoing loop circuit ['2 to the remote station 65 tioned for operation and may make and break
either directly or through a central telegraph
the circuit to the local station unit H to enable
of?ce or exchange. The system having now been
the local printer to print the incoming signals
described with respect to transmission of out
in their original or deciphere'd condition. This
going enciphered signals, a description will now
circuit is as follows: From battery 18, through
be given wherein enciphered signals are received 60 the winding of local receiving relay
over con
over the loop circuit l2 from a remote station and
are deciphered by the ciphering system.
Since the normal condition of the remote sta
ductor 23, over conductor 24, through contact
tongue 25 (when attracted) of transmitting re
lay 25, over conductor 27, over conductor 23,
tion in its idle or rest position is marking (cur
through upper contact 29 of switch ll, over con
rent on the line conductors), the relay ‘II will be 65 ductor til, through the local station unit ll, over
energized over the previously described circuit
including conductors I57 and £62. Thus, when,
conductor 32, through tongue 33 of switch I],
and over conductor M, to ground. The circuit
code signals are received from the remote sta
shown in Fig. 1 therefore provides a ciphering
tion, the start impulse will cause relay ‘H to be
system in which messages may be either en
come de-energized. When this occurs, contact 70 ciphered or deciphered dependent upon the di
tongue I93 of receiving relay "H is released and
the following circuit is completed: From battery
35, through contact tongue 11 of relay 39, over
conductor ltd, through the winding of direction
relay 31, over conductor I55, through contact
rection of ' transmission.
Another form of the invention about to be de
scribed is shown
Fig. 2. The circuit shown in
Fig, 2 resembles the circuit shown in F151.
Particularly, in. this form of the invention there
is provided,no..overlap*feature,‘and a double
wound transmitting relay 205 is employed instead
of a singlewound transmitting relay 26.
circuit for Fig. 2, therefore, will only be described
with respect to the portions wherein it varies
from the disclosure of Fig. ,1. ,
_In the modi?cation, a distributor 20! and a
and contact tongue 235 is rendered e?ective for
When opposite conditions exist in the windings
of the double wound transmitting relay 205, that
is, with one winding conditioned for marking sig
nals and the other winding conditioned for spac
ing signals, the relay will become unbalanced
and its transmitting tongues 234 and 235 at
distributor ‘202 are "driven in synchronism upon
tracted. In other words, the two windings of
the same rotary shaft, and at a speed suitable for 10 double wound relay 205 are wound reversely, and
the speed of transmission used. When start mag
thus have the effect of neutralizing each other
net 263 receives the start or no-current impulse
when current vis present in both- windings‘, so
at the commencement of transmission, the dis
that a condition of current in both windings is
tributors are released for operation, and both
the same as current in neither winding, and in
brush arms now move together. Storing relays 15 both cases the armatures 234 and 235 willbe
204 will be conditioned in the manner described
released. On the other hand, .current in one
in connection with relays 33 of Fig. 1 to energize
winding and no current in the other Winding
the left-hand winding of double wound trans
will have the effect of attracting both armatures
mitting relay 205 when marking conditions oc
234 and 235, but only one armature will be ef
cur, over the following circuit: From battery 200, 20 fective for transmitting signals, since the circuit
through the left-hand winding of relay‘ 255, over
including the other armature will have been
conductor 206, through the conducting ring 201,
short-circuited. The circuit in Fig. 2 is in other‘
over brush 209, through a particular segment
respects similar to the circuit shown in Fig. 1,
208, over a particular conductor 2!! now condi
and it is therefore deemed unnecessary to de
tioned, through a particular contact tongue 2! 2
scribe again the circuit in detail.
to ground. As a particular storing relay 204 be
Another form of the invention is shown in Fig.
comes operative, it is locked up over the follow
3 which is similar to that shown, in Fig. 2‘ except
ing circuit: From battery I99, over conductor
that instead of the employment of a singledouble
2!3, through the winding of a particular receiv
wound transmitting relay, as relay 205, there are
ing relay 204, through contact tongue 2!,5now
provided two separate transmitting relays 25!
attracted, over conductor 2i6, ‘and through con
and 252 operable by the identical circuit shown
tact tongue 2!‘! (when released) of relay 2|8 to
in Fig. 2. In the drawings, conductor 356 is the
ground. In the rest position of the distributor
same as conductor !50 of Fig. ,1, and conductors
20!, preceding each signal code combination, re
. 321, 366,- and 328 are respectively the equivalent
lay 2!8 is energized to attract its contact 2 I‘! and
of conductors 2'1, 65, and 28 of Fig. 1..
thus break any locking circuit which may have
'Relay 25! is operable either byvenciphered or
been previously established in the immediately
original signals to control its transmitting con
preceding signal code combination. This circuit
tacts 253 and 254. When the local station unit
is as follows: From battery 2|0, through the
255 is transmitting'enciphered signals over loop
winding of relay 2l8, over conductor 2l0, through
circuit 256 to a remote station, contact 253 is
segment 220 of distributor 20! , over brush 209,
e?ective and contact 254 is shunted out of the
through segment 22!,'to ground.
circuit due to the operation of the direction send
In synchronism with the operation of the stor
ing relay 25‘! which attracts, its contact tongue
ing relays 20s to control the left-hand winding
364. On the other hand, when incoming. signals
of the double wound transmitting relay 225, key 45 are 'being received from the distant station ‘con
signals are furnished for control of the right
(tact 253 is short-circuited due to the closure of
hand winding of said double wound transmitting
contact 258 upon the operation of the direction
relay through the instrumentality of a key tape
sending relay 259. At this time the direction relay
222. Prior to the transmission of signal code
25'! is unoperated and armature364 is released to
combinations under the control of the key tape 50 render transmitting contact 235 eifective.
transmitter during each cycle of operation, tape
It has already been explained that the cipher
stepping magnet 223 is operated, to step the tape
ing system herein employed is predicated‘upon
to a new position, over the following circuit:
the combination of key signals provided by a key
From battery I98, through the stepping magnet,
tape with either original or enciphered signals.
223, through segment 224 of distributor’ 20!, over 65 Under opposite operating conditions. that is, with
the brushes !91 and through the segment I96 to
one element of the code, provided by the key sig
nals, marking, and a corresponding element of the
The circuit for the right-hand winding of‘v re;
code, provided by an enciphered or original signal,
lay 205 is as follows: From battery,‘ through the
spacing, produces a marking condition of the
right-hand winding of relay 205, over conductor 60 signaling line.
221, through solid conducting ring 228 of dis- 7
Like conditions, however; that
is, with both elements of the code marking or »
_both elements of the code spacing, produce
tributor 262, over the particular segment 229
spacing conditions of the signaling line. Refer
conditioned, over a conductor 23!, through a'tape
ring again to the circuit shown in Fig. 3, it can
feeler contact lever 232, through the lower-or
marking contact I95, and over the conductor 233 65 be seen that according to the provision of key
signals for the relay 252 contact tongue 26! will
to ground. When signals are being transmitted
be operated, and it is apparent that ground'may
to av remote station, transmitting contact tongue
be carried over either conductor 262 or 263 to the
234 is rendered effectiveas hereinbefore described
contact tongue 253 of relay 25! when opposite
in connection with contact tongue 6'! of Fig. 1,
and transmitting contact tongue 235 is rendered 70 ‘conditions exist. As contact 253 moves back and
‘forth, it makes and breaks the circuit to the re
ineffective ‘by the short circuit including conduc
mote station over the loop circuit 256 thereby to
tors 327'and 366 and contact 364. On the other
transmit enciphered signals to the remote station.
hand, when signals are being received from a re
However, when incoming signals are received
mote station, contact tongue 234 is short-circuited 75 from the remote station over line 256, receiving
relay 25] receives signals in their enciphered con
dition, and its associated contact 254 is adapted
to cooperate with contact 2555 to make and break
the circuit to the local printer 255. At this time
contact tongue 364 of direction relay Z5‘! is open
and consequently in this direction of transmis
sion, conductors 32‘! and 3% do not provide a
shunt circuit. Conductor 2H now receives bat
tery through the winding of relay 212, over the 10
conductor 21!, through the conductor
ing battery for transmitting contact 255% which
may be extended over either conductor 212 or 213.
Therefore, contact tongues 254 and 251% will oper
ate together to make and break the local circuit
to the. printer 255 according to signaling condi
In Figs. 4 and 5 are illustrated schematically a
method, of connectingv intercommunicating sta
tions, whereby a convenient way of reversing the
loop circuit at said. stations isv provided. As pre- ~_
viously described, the loop circuit of the system
shown in Fig. 1 extends from ground, through
contact 51, over conductor I58, through the
winding of relay ‘H, over conductor I51, through
switch ll, over line loop l2 to the distant station
and returning again through the switch l1, and
then over conductor I52 and through battery I48
What is claimed is:
1. In a repeater system, a double wound relay,
two line sections, one of the windings of said re
lay associated with one line section and the other
winding associated with the other line section,
signal repeating means controlled by said relay,
switching means to condition the circuit for re
peating in one direction or the other, and means
operative upon initiation of a signal in one line
section to disconnect the winding associated, with
the other line section.
2. In a telegraph system, a double wound re
lay, two line sections, one of said windings asso
ciated with one line section and the other wind
ing associated with the other line section, a re
peater controlled by said relay and adapted to
repeat signals from one line section to another
line section, switching means to condition the cir
cuit for repeating in. one direction or the other,
means to control the operation of the switching
means according to the spacing or marking na
ture of the current on one of the line sections
when a signal is initiated, and means operative
upon initiation of a signal in one line section to
disconnect the winding associated with the other
line section.
3. In a repeater system, a ?rst station, a sec
ond station, a circuit connecting said stations,
double wound relay means. to transmit informa
"10 tion in both directions over the circuit, one of
the windings of said relay means associated with
from contact 61 have been shown as connected
one line section and the other winding associated
to a connector block 49 I. On any telegraph line,
with the other line section, automatic means
batteryis usually supplied at one end of the line
comprising a pair of instrumentalities at each
to ground. Itmay be desirable to provide bat
tery from the distant station, so, to accomplish
this result the conductor I62 and the ground lead
and ground at the other, and the installer has
speci?cations which, instruct him to strap certain
terminals together. By means of the present in
vention, it is only necessary to show different
strapping on the connector block to indicate the
different types of circuit. In Fig. 5, the. outlying
stations are indicated as connected throughan
exchange. 402.
It is to be understood that various changes: and
modi?cations may be made in the present inven
tion without departing from the. spirit andscope
station, one responsive to an. initial signal from
said ?rst station and the other responsive to an
initial signal from said second station to alter the
transmitting means at each station variably at
intervals according to which instrumentality re
ceives the initial signal, and means operative
upon initiation of a signal in one line section to
disconnect the winding associated with the other
line section.
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