Патент USA US2403680код для вставки
July 9, 1946‘ L, M_ POT-rs I - CIPHERING SYSTEMl Filed Oct. 19, 1942 ' FIG. I ' 2,403,680 ~ ' 2 Sheets-Sheet 1' '62 INVENTOR LOU IS M. POTTS July 9, 19460 1.. M. POTTS cIfHERINe SWEW Filed Oct. 19, 1942 I 2,403,680 7%» 2 Sheets-Sheet 2 FIG. 2 'INVENTOR LOUIS M._ POT TS \MIM_ ' 2,403,680 Patented July 9, 1946 UNITED STATES PATENT OFFICE; 1 Louis M. Potts. Evanston, Ill.,- assignor to. Tele type Corporation,‘ Chicago,- 111.; a corporation of Delaware Application October 19, 194,12, Serial N0. 462,523 18 Claims. (Cl; 178L221) 2 1 This invention pertains to prir'lting telegraph systems and particularly to a system for the trans mission and reception of secret telegraph mes In order to encipher messages by the present system the elements ofthfe' original code‘ combi nations are‘ combined with the elements" ‘(if code sages. combinations provided by a key tape. In‘ this ‘Secret signaling systems are desirable for naval, military and civil purposes wherein it ‘is required that messages be rendered uninterceptabl'e by arrangement, opposite‘ conditions; that is, with one element of the original code combination communication by tapping signal wires and in radio communication by means of receiving api spacing; produce‘ spacing‘. signals. vThis Jprje_ marking: and with'th'e‘ corresponding element of the key code‘ combination spacing; produce a persons unauthorized to receive them. The Sur marking signal.“ Like conditions, however, that reptitious interception of messages may ‘be ac complished, for example, in the case _of wire 10 is', with both elements marking or both elements paratuses tuned to the proper frequencies. sumes;,jer"course; that each (if the e'l'ements‘j‘fdf tnejre'spective code combinations are rented-1 to each‘other' That is‘, the“ No. 1' element of. the" is the provision of a reliable and practical tele 18 originalcodeicombinatio’n'is combined with the The primary object of the present invention graph circuit arrangement for rendering mes No‘. 1': element’ of the key'co‘de combination, and‘ sages unintelligible to' unauthorized persons. Another object of the present invention is the provision of a ciphe'ring system for telegraph so f6rth.'.To1take‘ aspe'c'i?c“ illustration‘, let it phering unit that is easily and readily attach able and detachable to standard telegraph print ing apparatus having transmitting and receiving the B'audot' code’ is composed 'consecutivelyjof I assumed that it' ‘is, desired t6 'en‘c'ipher ‘ the letter-TR” which in the Baudotco'de‘ is composed messages including an electrical circuit system 20 consecutively of spacing, marking, spacing;_mark¥ which is automatically conditioned either to en assumed that the‘ key tape‘ with‘ which the par; cipher or decipher signals according to the di ti'cul‘ar‘ enciphering operation ism beperrcrmed rection of transmission. occupies“ apositien' whereat ‘it is‘ conditioned‘ for A further object of the invention is to provide a portable self-contained enciphering and‘ deal. 25 prcduci'ngthe letter “Y”;combination which’in facilities. I y marking; spacing; niarkin‘g',‘spacing, and marking cohd'ition's. Under the“ assumed conditions, the‘ enciphering operation wouldresult in thei'proi In one form, the invention utilizes a receiving 30dilation; of an all marking or “letters” combina ticn since in this‘ particular‘illustration’opposite distributor by means of which a set of ?ve ref ceiving relays are conditioned upon the receipt of enciphered or deciphered signals and a key tape transmitter for providing key signals. The key signals are combined with the signals pro-# vided by the receiving relay and produce‘ result ant signals which are transmitted by means‘ of a. transmitter-distributor to a transmitting re lay having a pair of associated transmitting con (fOl‘lditiOIlS Of all the‘ elements of “R.” and _“Y” code combinationsv are provided. This will be readily apparent; from the’ following chart'where léllllér “Ml’? indicates 2. Ih'ELI‘kil‘lg‘ C'On‘d‘itidn arid the‘ léttbyi‘ “S” indicates a‘ spacing condition. 12 s, tacts, only one of which is effective for transmis'e 40 ‘Originalsignal"‘R”;__;l..__l _____________ __ M sion at a time dependent on the direction of transmission. Key sign'al “Y” ______________________ “1-.., Encipliered signal “letters” ____ .; _________ _ _ lVI . w.I 4-5 3 .")? 7. A second form of the invention features the use of a double wound relay for enciphering and It is} understoda that ‘both; the- transmitting deciphering messages. One winding of the relay 45 and’ receiving end of a telegraph line will be equipped‘ with idential key‘ tapes; which during? ’ is under the control of key signals and the‘ other messagetransmiss'icn wi-ir occupyidentical posi winding is under the control of either enciphered‘ tions. The key tapes are advanced‘ ammg'rrans or original signals dependent upon the’ direction mis'si‘onmto continuously modify the key signal,’ of transmission. In this instance; two' distribu tors are provided, one for key signals and the‘ 50 but both‘ tapes‘ occupy position at all times. other for either the original or enciphered sig the same cam-spending station which receives . enciphered signals is thus enabled’ to decipher the nals. ‘ unintelligible signals - transmitted over the" tele A third form of the invention closely resembles g-r'ap'hi line- by combining enciphered signals with the second form except that two separate? relays‘ are employed for transmitting purposes instead 55 key signals: provided by its‘ key tape. To. illus-‘ t'rate' a‘ deciphering operation, the example given of a double wound relay. 2,403,680 3 above in connection with the enciphering opera tion will be continued and it will be assumed that a receiving station received the enciphered start magnet 44 releases distributor 45 for the reception of a signal code combination from sta tion unit I I at this time, and the distributor is signal; namely, “letters.” The “Y” combination provided by the key tape at the receiving station brought to rest upon the impression of the stop 5 can now be combined with the “letters” combi nation to decipher the enciphered signals to thereby reproduce the original signal “R” as clearly shown in the following chart: 1 Enciphhered signal “letters”- Key signal “Y” __________ __ __ Original signal “R” _______________________ _. M M S 2 3 4 lows: From battery 52, through the winding of 10 relay 5|, over conductor 53, through segment 54 .of the distributor, over the brushes 55, and 5 M'M through conducting ring 56 to ground. As brush 55 moves off segment 54, the circuit for relay -5I is broken, whereupon armature 51 is released to open contact 49 to break the energizing circuit of start magnet 44, and moreover, direction relay WEE Ms SM 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 made for relay 5| which may be traced as fol The invention may be more readily understood 39 becomes locked up over the following circuit: from the following detailed description and the drawings wherein, From battery 35, through contact tongue 36 of direction relay 31, over conductor 33, through the Fig. 1 is a circuit diagram of the main em 20 winding of direction relay 39 (now energized), bodiment of the invention; through its associated contact tongue 6|, over Fig. 2 is a circuit diagram of a second form of conductors 62 and 63, through contact tongue'5‘I the invention; of relay 5i (now de-energized) and through con Fig. 3 is a circuit diagram of a third form of tact 58 of the make-before-break contact 48 to the invention; and ‘ ground. Figs. 4 and 5 are schematic views showing methods of interconnecting communicating sta tions. tact tongue 64 is held attracted so that transmit ting contact 25 of transmitting relay 26-is shunted 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 II desires to communi out of circuit over conductors 21 and 65 inasmuch ‘ as at this time it is desired to transmit from station II to the remotestation over the. trans mitting contact 51.. This prevents theoperation of contact 25 from interfering with the opera cate with an outlying station over a loop circuit tion of the circuit under the first assumedconj dition with station I I transmitting. At this time, indicated at I2. 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 l4, may be readily plugged into the loop circuit. Similar plug and jack connections for the sta tion unit II and the loop I2 are shown respec tively at I 5 and I6. the direction relay 39 also ‘holds its associated tongue 68 in its attracted position so thatcon tact tongue ‘I3 associated with relay ‘II is‘shunt -' ed out of circuit and rendered ineiTective, in view, 40 The apparatus is provided with a manually-operable switch shown gener ally at IT, by means of which the local station unit II may be conditioned to transmit and re ceive either regular telegraph messages or en . With direction relay 39 thus energized, its con- ' of the fact thatit is necessary at this time that outgoing signals which are transmittedfthrough the relay ‘II do not interfere with the operation of the circuit. This shunting circuit is as fol , lows: From contact tongue 68, over conductor 12, 45 through contact tongue ‘I3 (if it should be at tracted by its associated receiving relay 'II) over conductor ‘I5, over conductor ‘I5, and overcon mit or receive enciphered messages, switch I‘! is ductor ‘I6 back to the contact tongue 68. operated to its upper or coding position, and The operation of direction relay 39 further re conversely, when it is desired to transmit or re 60 sults in the attraction of its contact tongue'TI to ceive regular telegraph messages, switch I‘! is deprive direction relay 3'! of battery so that the positioned to its lower position. local station unit II matr assume complete con The circuit for the local station unit II may trol of the circuit, and therefore signals from ciphered messages. When it is desired to trans be traced as follows: From battery I8 through ‘ a remote station at this time will be ineifectual to the winding of receiving relay 22, over conduc 55 seize control of the circuit. After every'revolu tors 23 and 24, through contact tongue 25 of tion of the distributor 45, brushes 55 return to transmitting relay 26, over conductors 21 and their rest position whereat the previously de 28, through tongue 29 of switch I‘I, over conduc scribed circuit is made to the relay 5| which by tor 3i , through the station II, back over the con its operation attracts its tongue 51 to breakthe ductor 32, through tongue 33 of switch I1, and so locking circuit to relay 39 to return the circuit over conductor 34 to ground. to normal in preparation for subsequent. opera When local station unit I I commences to trans tions. ' . ' mit, the just-described circuit is interrupted and As the original signals are received‘ from sta relay 22 is de-energized due to the transmission ; - tion unit II by the local relay 22, contact tongue of the start or no current signal. When this 8| is operable to make and break the following occurs, the following circuit is established: From 65 circuit, according to whether marking or spacing battery 35, over tongue 36 of direction relay 31, impulses are being transmitted: ‘From battery82 over conductor 38, through the winding of di through the windings of the receiving relays 83 rection relay 39, over conductor 4|, through con ‘ (receiving marking signals), over conductors, 8t tact tongue 42 of receiving relay 22 (now de 70 to 8B, dependent upon the code combination be? energized), over conductor 43, over conductor 46, ing transmitted, through associated segmentsf89, through the winding of start magnet 44 associ over brushes 9|, over the solid conducting ring ated with receiving distributor 45, over conduc 92, over conductors 93 and 12, through contact tor 41, and through contact 49 of make-before tongue 68 (now attracted) of direction relay 39, break contact 48 to ground. The operation of 75 over conductors ‘I6 and 95-and through ‘the con-, 23,403,686‘ 5 . I26 or I21, and through a-contactltongueVIZIto , ground; When a particular receiving relay 83'becomes energized over the just-described circuit, it‘is locked up as follows: From battery 82, ‘through the Winding of a particular relay "83, over its contact tongue 96, over conductor 6 conditioned‘ for operation through; a tape reel-er contact tongue- I22, over either the conductor tact tongue 8| of local receiving relayL22 (when marking signals are being receivedv and receiving relay 22 is accordingly energized) to ground. In order to provide for the previously ‘ir'iene tioned ‘overlap condition, the lower twovreceivi ing relays 33 will cooperat‘e’by means of their tongues I2I with the lower two tape feelericoni 97, '- and tact tongues I22 in a slightlydifferent manner; , through contact 98 of locking relay 99 to ground. Prior to the reception of each signal code-‘com 10 Whenv either-of the lower two tape'feelei‘ contact tongues I-22 move to ‘their lower, or marking po bination, locking relay 99 is momentarily‘ ener sition',» upon the sensing of‘a perforation in‘- the gized to break previous locking circuits, which key tape, a circuitis completed upon the opera, . may have been completed over the following cir- ' tion of overlap control relay Ii4I.- 7' only" the one cuit: From battery IIII, through‘the‘winding' of locking relay 99, over conductor I02, throuEh_seg 15 eration of thelowermost overlap relay .I'SEI ‘will be _, described; The Circuit iS-aS fOllOWS'I Fl‘Oh'li?éittéi’Y ' ment I93‘ of the distributor 45", over‘lthe brushes I32, through the winding of relay l‘slfover con-'4 55, and through the solid conducting ring'56 to ground. ductorI42', through feeler-coritact I22; over con ducto'r I44, through contact tongue I45 of over: lap control relay I4I (when operated) toi'g'round}; When contact tongue I45 is attracted by? over lap control relay I4I, as will be later explained, ‘ In order to effect the enciphering of out-going messages and the deciphering of incoming vmes 20 sages, there is provided in the ciphering system of the present invention, a key tape transmitter in make-before-break‘ contact I46 will be'operated dicated generally at II I which utilizes a key tape to break a previousrlocking circuit for either of H2, It will be understood, of course, that each the overlap relays I3I if they have been pre viously energized in a preceding signal co‘de'com'e station will be provided with identical key tapes which occupy identical positions during commue nicating operations. The only prerequisite is that bination. This locking circuit extends ‘from ‘bat tery I32, through the winding of relay I3I, over at any particular instant or communicating op contact tongue I5'I,.conductor I52, and through eration, the key tapes at the interconnected sta tions be identical, because the key tapes may be 30 make-before-break contact I46 to ground.» It'i's thus apparent that if in the immediately precedf di?erent at different times or operating periods. Enciphered or deciphered signals dependent upon ing signal combination lower tape" feelers~I22 were in their spacing positions their associated the direction of transmission, are delivered to overlap relays I3'I would not have been operated’, the transmitting relay 26 through the instru and consequently’, although tongue ' I45 willoper‘; 35 ate, it will not; unlock any circuit inasmuchla's Shortly after the operation of the receiving there was'jno circuit previously preparedffor‘the distributor 45, segment H4 thereof is traversed relays I3VI. The‘ operation of tongue I45'a1so per; by the brush 55 and a circuit is completed to the forms the function of providing ground over jc'o'n- . start magnet H5 of the transmitting distributor H3 from ground, through solid conducting ring 40 ductor I44, through the windings of relay I31I>if th'eyjajre" prepared by a'marking condition of feel; 56, over brushes 55, through segment H4, through ers I22 fora marking operation in the next posie the winding of start magnet H5, and through tionofkey ta'peIIZ. , f l ‘3 " battery H9 to ground, to place transmitting dis Overlap control relay I41 ‘is momentarily ener1 tributor I I3 in operation. It is, therefore, observ able that the transmitting distributor" H3 lags l gized'at' each cycle of operation of‘distributo'r 45 > prior to the transmission of the si'gnalicode‘com‘e behind receiving distributor 45, the purpose of bination over the following circuit: F'rom‘bat; which is to provide an overlap arrangement to mentality of a transmitting distrlbutor H3. secure the proper margin of operating time for tery I41, through, the winding of relay I41‘, over time interval. tions of tongues I33 of'ove'rla'p relays I3I and the c'ondhctor I53, through the contact segment I54 the ciphering operation, to insure that the re-~v ceiving relays 83 and the key tape I I2 are prop 50 of ‘distributor 45, over conductor ring 56, to ground. In accordance with the‘ combined posi erly conditioned for operation at the required tongues I2I of the lower two receiving‘ relays 83, 7 As the receiving relays 83 respond to signals, ground may be furnished when ‘marking condi associated tongues or armatures I2l are either attracted or not, depending upon whether a marking or a spacing signal is impressed on stor ing relays 83. The circuit for the upper three tions occur over either conductor‘ I34 or I35, through the contact tongue I33, o'v'e'r' conductor I55, through brush I56, over' the solid conducting ring I24 and over conductor 123', throughvth'e winding of transmitting relay‘26 to battery I I6. receiving relays 83 is so designed with respect to the upper three tape feelers I22 of key tape I I2 that a marking signal will be produced when the ' During eachrevolution o’f distributor“, Step1 tongues I 2| of the relays 83 are conditioned to a ping magnet I20 is operated to step the key tape position opposite to that of the corresponding to a new position as steppingcontrol relay I'39'is ' tape feelers I22. On the other hand, when a par ticular contact tongue I2I moves to a position similar to the position assumed by its associated tape feeler I22, the circuit is conditioned to pro duce a spacing signal; therefore, when contact a momentarily energized over the following'circiiit: From battery, through the winding .of~ relay I 39‘, over‘ conductor I49‘, through brushes 55 and over the solid conducting ring 56in) ground. jlleelay" I39‘ attracts" and then- releases it's/tongue I59 to control‘ an obvious‘steppingi‘circuit‘to aerate tongue I 2I and tape feelers I 22 are bothv mark‘ ing or both spacing, a spacing signal will be sent. magnet I20. ‘Due to the overlap'féatlire which; ' The circuits for making signals may be traced To ‘ ' has been described'the stepping’ina'gnet is’ eperg as follows: From battery H6, through the wind ing of transmitting relay 26, over conductor I23, through the solid conducting ring I24 of the transmitter distributor H3, through brushes I56 and segments I I1, over a particular conductor I55 a ate'd While the fourth and ?fth sighals'al‘é being‘ transmitted since overlap} relays I 3| I are ldck'ed up and retairithe fourth and ?fth elements or the signal. code of the prenous'rcode ‘co'lhbiha?ié?' ‘ 7 impulses by the key tape I I 2. When spacing sig-_ 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 operation, of start magnet 44 and the direction relay 31 is energized and becomes locked up over the following circuit after brush 55 passes off of segment 54_to cause the de-energization of relay 5|: From battery 35, through tongue 11 of direc nals are provided in the fourth and ?fth elements of a ‘key code combination by the key tape, tongues I33 of the overlap relays I3I will remain unattracted in spacing position. As relay 26 is affected by the enciphered sig nals, its contact tongue 61'is, opened and closed according to the signals that are being trans mitted to the remote station. The signals trans tion relay 30, over conductor I64, through the winding of direction relay 31, through contact tongue I12 (now attracted), over conductors 62 The key signals (that is, the signals controlled by and 63, through tongue 51 of locking relay 5| and the key tape) are provided only for the code im through make-before-break"contact 48 to ground. pulses and not for the start and stop impulses; The attraction of tongue 36 by the direction re the latter impulses being invariable and aresup ‘ plied independently of the key tape by the dis 15 lay 31 breaks the possible operating circuit for ‘di mitted, are, of course, start-stop code signals. rection relay 33 so that again it is apparent that’ the station which ?rst seizes'cont'rol of the sys tribll?Ql‘ segments I I8 and II9,of_ the distributor I,I3. Sincethe normal stop condition of the line is marking,~the stop impulse impressed on ‘the line is controlled by the energized relay 26, whose cir tem prevents the other station from operating during a signal code combination. ‘ 7 When direction relay 31 operates, contact cuit under this condition extends from battery 20 > tongue I 13 associate'd'therewith is attracted’so II6, through the winding of relay 26, over con 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 II8 to ground. Then ence by this contact with the circuit at this time. upon initiation of transmission, when start mag net II5 is energized and brushes I56 are caused 25 This circuit is as follows: From ground, through contact tongue I13 of relay 31, over conductors to traverse the segments, the traversal of brushes I14 and I50, throughcontact tongue 61 to ground. I56 over the start segment IIS will produce a no It is thus obvious that when‘ the contact tongue current condition on the line, since no battery is connected to the start segment IIB. Hence, the 51 operates inasmuch as, it is directly grounded, circuit previously traced for relay 26 will j be 30 it will not cause the repetition of‘signals at this broken, and relay 26 will become de-energized to Operationfof direction relay 31 further causes release its armatures 61 and 25 to, transmit start impulses, either to the line I2 or to the local unit the attraction of its associated contact tongue II, depending upon' the short'circuit condition I15, and ground for the storing relays is fur of said contacts 61 and 25, as previously described. 35 nished over the following circuitLFrom battery time. ’ ‘ ' ‘ This causes the opening and closing of loop circuit I2 to operate a printer at the remote station. This circuit is traceable as follows: From ground, 82 to a particular receiving relay 83, over one of the conductors 84 to 88, through its associated contact segment 89, over brushes SI, through through transmitting tongue 61, over conductor I50, through the Winding of relay 1|, over con ductor I51, through the lower switchtongue I58 of switch I1, over conductor I59, throughlthe plug and jack connection I6, through the out the solid conducting ring 92, over conductor 93, through contact tongue 13 of relay 1|, over con ductor 14, through contact tongue I15 (now at tracted) of direction relay 31, to ground. going part of the loop to the remote station, back through theplug connection I6, through the plug connection I4 of the check printer I3, over con ductor I6I, through switch tongue I60 of switch I1, and over conductor I62 to battery I49. The ' Distributors 45 and H3 will act in the same manner as when signals were being sent. out or 45 transmitted, .to_ now decipher the incoming sig nals to cause the deciphered signals to be re peated by the transmitting relay 26. It Wi11'b8 remembered that contact tongue 61 of transmit enciphered signals which will be printed by the ting relay 26 is now short-circuited and’ ren check printer I3 are also transmitted over the 50 dered ine?‘ective for transmission. However, at outgoing loop circuit I2 to the remote station this time, transmitting contact tongue 25 ‘is con either directly or through a central telegraph omce or exchange. The system having now been described with respect to transmission of outgo ditioned for operation and may make and break the circuit to the local station unit II to enable the local printer to print the incoming signals ing enciphered signals, a description will now be 55 in their original or deciphered condition. This given wherein enciphered signals are received circuit is as follows: From battery I8, through over the loop circuit I2 from a remote station and the winding of local receiving relay 22, over con are deciphered by the ciphering system. ductor 23, over conductor 24, through contact Since the normal condition of the remote sta tongue 25 (when attracted) of transmitting relay tion in its idle or rest position is marking (cur 26, over conductor 21, over conductor 28, through rent on the line conductors), the relay 1I will be upper contact 29 of switch I1, over conductor energized over the previously described circuit 3|, through the local station unit II, over con including conductors I51 and I62. Thus, when ductor 32, through tongue 33 of switch I1. and code signals are received from the remote station, over conductor 34, to ground. The circuit shown the start impulse will cause relay 1| to become 65 in Fig. 1 therefore provides a ciphering system de-ene'rgized. When this occurs, contact tongue in which messages may be either enciphered or I63 of receiving relay 1| is released and the fol deciphered dependent upon the direction of trans lowingvcircuit is ‘completed: From battery 35, through contact tongue 11 of relay 39, over con ductor I64, through the winding of direction re lay 31, over conductor I65, through contact tongue I63 of receiving relay 1| (now'de-ener mission. , ' Another form of the invention about to be described is shown in Fig. 2. The circuit shown in Fig. 2 resembles the circuit shown‘in Fig. 1. gized) , over conductor 46, through the winding of Particularly, in this form of the invention there is provided no overlap feature, and a double start magnet 44 of the receiving distributor 45, woundtransmitting relay 205 is employed in over conductor 41, through the make-before-_ 75 stead, ofa single wound. transmitting relay 26. 2,403,680 9. The 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 2M and a distributor 202 are driven in synchronism upon the same rotary shaft, and at a speed suitable for . 1'0‘ _ signals and the other winding conditioned for spacing signals, the relay will become unbalanced and its transmitting tongues 234' and 2351 at- . tracted. . In other words, the two windings of double wound relay 205 are wound reversely, and thus have the effect of neutralizing-each other when current is present in both windings, so that a condition of current in both windings is the speed of transmission used. When start mag net 203 receives the start or noecurrent impulse the same as current in neither winding, and in at the commencement of transmission, the dis tributors are released for operation, and both 10 both cases the armatures 234 ‘and 235 will be released. On the other hand, current in- one brush arms now move together. Storing relays winding and no current in the other winding. 254 will be conditioned in the manner described will have the effect of attracting. both armatures in connection with relays 83 of Fig. 1 to ener 234 and 235, but only one armature willbe effec gize the left-hand winding of double wound transmitting relay 205 when marking conditions 15 tive for transmitting'signals, since the circuit including the other armature will have been occur, over the following circuit: From battery short-circuited. The circuit in Fig. 2 is in other 20!), through the left-hand winding of relay 205, respects similar to the circuit shown in Fig.1, over conductor 236, through the conducting ring and it is therefore deemed unnecessary to dee, 201, over brush 299, through a particular seg ment 208, over a particular conductor 2H now 20 scribe again the circuit in detail. ‘ ' Another form of the invention is shown in Fig. 3 which is similar to that shown in Fig; 2 except that instead of the employment of, a single dou ble wound transmitting relay, as relay 205, there following circuit: From battery I39, over con ductor 2l3, through the winding of a particular 25 are provided two separate transmitting relays conditioned, through a particular contact tongue M2 to ground. As a particular storing relay 204 becomes operative, it is locked up over the receiving relay 234, through contact tongue 215 now attracted, over conductor2l5, and through 25I and 252 operable by the identical circuit shown in Fig. 2. a In the drawings, conductor 356 is the same as conductor I50 of Fig. 1, and con contact tongue 2H (when released) of relay 2l8 ductors 321, 356, and 328 are‘ respectively the to ground. In the rest position of the distributor 20l, preceding each signal code combination, re 30 equivalent of conductors ‘21, 66, and 28 of Fig. 1. Relay 25! is operable either by enciphere'd' or lay 2l8 is energized to attract its contact 2|‘! original signals to control its transmitting con and thus break any locking circuit which may tacts 253 and 254. When the local station unit have been previously established in the immedi 255 is transmitting enciphered signals over loop ately preceding signal code combination. This circuit is as follows: From battery 2H3, through 35 circuit 256 to a remote station, contact 253 is effective and contact 254 isv shunted out of the the winding of relay 218', over conductor 2l9, circuit due to the operation of the direction send- ' through segment 220 of distributor 2!“, over brush 209, through segment 221,, to ground. ing relay 25'! which attracts its contact. tongue 364. On the other hand, when incoming: sig In synchronism with the operation of the stor ing relays 204 to control the left-hand winding 40 nals are being received from the distant station contact253 is short-circuited due to' the closure of the double wound transmitting relay 235, key of contact 258 upon the operation of :the direc signals are furnished for control of the right tion sending relay 259. At this time’ the'direction hand winding of said double wound transmitting relay251 is unoperated and armature v364 is re relay through the instrumentality of a key tape 222. Prior to the transmission of signal code 45 leased to render transmitting contact 235 .e?fece combinations under the control of the key tape It has already been explained that the cipher tive. . . - ~ transmitter during each cycle of operation, tape stepping magnet 223 is operated, to step the tape ing system herein employed, is'predicatedupon the combination of key signals‘ provided by a to a new position, over the following circuit: From battery I98, through the stepping magnet 50 key tape with either original or encipheredsige nals. Under opposite operating conditions, that 223, through segment 224 of distributor 25!, over is, with one element of the code, provided .by the brushes I91 and throughv the segment I96 the key signals, marking, and a corresponding to ground. element of the code, provided by an enciphered The circuit for the right-hand winding of re or original signal, spacing, produces a marking lay 205 is as follows: From battery, through the 65 condition of the signaling line. Like'conditions, right-hand winding of relay 205, over conduc however, that is, with both elements of ‘the code tor 221, through solid conducting ring 228 of dis marking or both elements of- the code spacing, tributor 232, over the particular segment 229 produce spacing conditions of the-signaling line.’ conditioned, over a conductor 23!, through a Referring again to the circuit shown in Fig. '3, 60 tape feeler contact lever 232, through the lower it can be seen that. accordingv to the provision or marking ‘contact I35, and over the conductor of key signals for the relay 252 contact tongue 23l will be operated, and it is'fapparent that mitted to a remote station, transmitting con ground may be carried over either conductor 252‘ tact tongue 234 is rendered e?ective as herein or 263 to the contact tongue 253, of relay 2_5| before described in connection with con-tact 65 when opposite conditions exist. vAs contact 253 tongue 61 of Fig. l, and transmitting contact moves back and forth, it makes and ‘breaks the tongue 235 is rendered ineffective by the short circuit to the remote station over the loop cir circuit including conductors 3-21 and 356 and con 233 to ground. When signals are'being trans tact 354. On the other hand, when signals are being received from a remote station, contact 70 tongue 234 is short-circuited and contact tongue 235 is rendered e?ective for transmission. When opposite conditions exist in the windings of the double wound transmitting relay 235, that is, with one winding conditioned for marking 75 cuit 256 thereby to transmit enciphered Signals to the remote station. ' ‘ ‘ However, when incoming signals are received from the remote station over line 255, receiving relay 25! receives signals in their enciphered condition, and its associated contact 254 is adapt ed to cooperate with contact 264' to make and 2,403,680 11 12 break the circuit to the local printer 255. At this time contact tongue 364 of direction relay 251 is open and consequently in this direction of transmission, conductors 321 and 366 do not pro ing circuit disposed between said positions, and automatic means in said circuit comprising a pair vide a shunt circuit. of relays, one responsive to an initial signal from one of said positions and the other responsive to an initial signal from the other of said positions to cause the circuit to act in an enciphering man ner or a deciphering manner according to which Conductor 2'“ now re ceives battery through the winding of relay 212, over the conductor 2'“, through the conductor 3B6 providing battery for transmitting contact relay receives the initial signal. 264 which may be extended over either conduc 5. In a signaling system, a double wound relay. tor 212 or 213. Therefore, contact tongues 254 10 means to transmit to one winding start-stop and 264 will operate together to make and break permutation signals, means to transmit to the the local circuit to the printer 255 according to other winding similar permutation code signals signaling conditions. only which have the reverse e?ect of signals in In Figs. 4 and 5 are illustrated schematically the ?rst winding, and contacts operated by the a method of connecting intercommunicating sta 15 relay to transmit start-stop signals in which only tions, whereby a convenient way of reversing the the code element of the signals are modi?ed by loop circuit at said stations is provided. As pre the second winding. viously described, the loop circuit of the system 6. In a ciphering system, means to generate shown in Fig. 1 extends from ground, through signals including an invariable .starting portion 20 contact 61, over conductor I50, through the wind and a variable portion representing information, ing of relay ‘H, over conductor I51, through means to generate ciphering signals, having an switch l1, over line loop l2 to the distant station invariable blank portionand a variable code por and returning again through the switch l1, and tion, means to operate the two generating means then over conductor I62 and through battery I49 in step so that corresponding elements of the two to ground. It may be desirable to provide bat signals are simultaneous, and means controlled tery from the distant station, so, to accomplish by the two simultaneous signals to generate a this, result the conductor I62 and the ground lead third modi?ed signal in which corresponding ele from contact 6‘! have been shown as connected to ments are generated substantially simultaneously a connecter block 40!. On any telegraph line, with the corresponding elements of the ?rst and battery is usually supplied at one end of the line 80 second mentioned signals. _ and ground at the other, and the installer has speci?cations. which instruct him to strap cer tain terminals together. By means of the present invention, it is only necessary to show different 7. In a ciphering system, means to generate start-stop permutation code signals representing information to be communicated, a regenerative repeater controlled by said signals, andcipher strapping on the connector block to indicate the 35 ing means to determine the marking or spacing di?‘erent types of circuit. In Fig. 5, the outlying character of the code elements of the regenerated signals impulse by impulse as the corresponding stationsare indicated as connected through an exchange 402. It is to be understood that various changes and modi?cations may be made in the present in vention without departing from the spirit and scope thereof. _ What is claimed is: > 1. Ina telegraph system, a double wound relay, impulses are received. 40 , 8. In a ciphering device, two transmitting dis-7 tributors of start-stop permutation code signals, means to operate the two distributors in phase under control of said code signals, means to de termine the character of the code impulses trans 45 mitted by one distributor according to informa~ means to transmit to one winding of said relay tion to be communicated, means to determine the start-stop permutation code signals, means to character of the code impulses transmitted by the transmit to the other winding code signal ele other distributor according to a prearranged mentsonly so that each of the corresponding plan, means to invariably repeat the start im code elements in the two signals occur at the pulse unaltered, and means to generate en same time, and means to generate signals con ciphered signals under control of the two sets trolled by the contacts of said relay. of signals. 2. In a ciphering system, two circuits, on one 9. In a ciphering system, a signaling circuit, a of which plain signals are always transmitted ?rst station, a second station, transmitting and and in the other of which enciphered signals are receiving telegraph apparatus at each‘ station, always transmitted, a circuit adapted to encipher 55 a single ciphering key mechanism at each sta plain signals and to decipher enciphered signals, tion associated with both the receiving and trans a ?rst relay in one of said circuits, a second relay mitting apparatus at that station, means to con in the other circuit, a ?rst contact in the ?rst trol the receiving apparatus at each station by circuit, a second contact in the second circuit, the transmitting apparatus at the other station means to operate both contacts according to the 60 over said circuit, means to condition the key output of the ciphering device, means to control mechanism for enciphering or deciphering ac the input of the ciphering device according to the cording to the direction of transmission, and operation of either relay, and means to render automatic means comprising a pair of relays, one 65 responsive to an initial signal from said ?rst tacts ineffective according to which relay receives station and the other responsive to an initial an initial signal. signal from said second station, to alter the key one of the relays ineffective and one of the con 3. In a repeater, means to transmit to said re mechanism conditioning means at intervals‘ ac peater signals comprising a start impulse and a cording to which relay receives the initial signal. plurality of variable code impulses, means to in 70 10. In a ciphering system, a ?rst station, a sec variably repeat the start impulse unaltered, and ond station, a circuit connecting said stations, means to modify the code impulses according to a prearranged plan. 4. In combination with a repeater, two line po means to transmit information in, both directions over the circuit, a single variable key ciphering mechanism at each-end of the circuit operable 75 on signals in either direction and means compris sitions, a combination enciphering and decipher - 2,403,680 13 ing a pair of relays in each ciphering mechanism, one responsive to an initial signal from said ?rst station and the other responsive to an initial sig nal from the second station, for ‘automatically conditioning said mechanism for operation ac cording to which relay receives the initial signal. 11. In a ciphering system, a ?rst station, a second station, a circuit connecting said stations, means to transmit information in both directions over the circuit, a single variable key ciphering‘ mechanism at each end of the circuit operable on signals in either direction, and automatic means comprising a pair of instrumentalities in each ciphering mechanism one responsive to an initial signal from said ?rst station and the other responsive to an initial signal from said second 14 15. In a telegraph system for enciphering and deciphering messages, a ?rst distributor, a second distributor, a third distributor, a plurality of storing relays connected to said ?rst distributor, acorresponding plurality of contacts controlled ' by said storing relays and connected to said sec ond distributor, means for sensing a. tape per forated according to a predetermined plan, a plurality of contacts controlled by said means and connected to said third distributor, a double wound relay having one winding connected to said second distributor and the other winding connected to said third distributor, and transmit ting contacts controlled by said double wound relay according to the combined in?uence of said second and third distributors to transmit result- ' ant signals. 16. In a telegraph system for enciphering and deciphering messages, ?rst, second, and third dis tributors, a plurality of storing relays connected 12. In a telegraph system, a ?rst station, a to said ?rst distributor, a corresponding plural second station, transmitting and receiving ap ity of contacts controlled by said storing relays; paratus at each station, a ciphering key mecha and connected to said second distributor, means nism, and automatic means comprising a pair of for sensing a key tape, a plurality (of contacts instrumentalities in each mechanism, one condi tioned in response to an initial signal from said 25 controlled by said means and connected to said third distributor, a double wound relay having, ?rst station and the other conditioned in re one winding connected to said second distributor sponse to an initial signal from said second sta and the other winding connected to said third tion, to alter the key mechanism for each sig distributor, transmitting contacts controlled by nal transmitted and each signal received accord 30 said double wound relay according to the com ing to which instrumentality is conditioned. station to alter the two key ciphering mecha nisms variably at intervals according to which instrumentality receives the initial signal. 13. In a telegraph system, a signaling circuit, a ?rst station, a second station, telegraph appa ratus at each station, means to operate the ap bined in?uence of said second and third distribu tors to transmit resultant signals, and means capable of being automatically conditioned to en paratuses for communicating information in cipher or decipher said signals according to the either direction over the circuit, a key mecha nism at each station, a pair of instrumentalities in each mechanism, one conditioned in response to an initial signal from said ?rst station and the other conditioned in response to an initial sig nal from said second station, and means to alter direction of transmission. the two key mechanisms according to which in strumentality is conditioned so that said mech anisms are continuously in step between two 17. In a telegraph system, two stations, a com munication circuit connecting the said two sta tions, telegraph transmitting and "receiving ap paratus at each station, ciphering apparatus asso ciated with each station, and automatic means comprising a pair of relays, one conditioned in response to an initial signal from one of said 1 two stations and the other conditioned in re- ' consecutive signals independent of the direction 46 sponse to an initial signal from the other of said two stations, to cause the ciphering apparatus to of transmission of the signals. 14. In a telegraph system for enciphering and deciphering messages, a ?rst station, a second station, a distributor at each station, a plurality act in an enciphering manner or a deciphering manner according to which relay receives the initial signal. ' ' 18. In a telegraph system, two stations, a com of storing relays connected to said distributor, means for sensing a tape perforated according 50 munication circuit connecting saidtwo stations, telegraph transmitting and recording apparatus to a predetermined plan, contacts controlled by at each station, two sets of siphering apparatus said means, means effective under the combined intermediate the two transmitting and ‘recording in?uence of said distributor and said sensing means to transmit resultant signals, and means 55 apparatuses, and automatic means comprising a pair of relays, one conditioned in response to an comprising a pair of instrumentalities, one con initial signal from one of said two stations and ditioned in response to an initial signal from said the other conditioned in response to an initial ?rst station and the other conditioned in re— signal from the other of said two stations, .to cause sponse to an initial signal from said second sta tion, capable of being automatically conditioned 60 each ciphering apparatus to operate in an en ciphering manner or deciphering manner accord according to which instrumentality is conditioned ing to which relay receives the initial signal. to effectuate the enciphering or deciphering of the said signals stored in said storing relays. ' LOUIS M. POTTS.