US1367717A - Printing-telegraph system - Google Patents

Description

P. M. RAINEY.

PRINTING TELEGRAPH SYSTEM.

APPLICATION FILED NOV. I5 |91]- Patented Feb. 8, 1921.

H wwwww UNITED STATES,PATENTA OFFICE.

.PAULl M. RAINEY, OF GLEN RIDGE, NEW JERSEY, ASSIGNOR TO WESTERN ELECTRIC COMPANY INCORPORATED, 0F NEW YORK, N. YY., A CORPORATION OF NEW YORK.

PRINTING-TELEGRAPE SYSTEM.

Patented Feb. 8,

Application led November 15, 1917. Serial No. 202,103.

To all whom 'it 'may concern:

Be it known that I, PAUL M. RAINEY, a citizen of the United States, residing at Glen Ridge, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Printing-Tele- .graph Systems, of whichthe following is a full, clear, concise, and exact description.

This. invention relates to printing telegraph systems, and particularly to multiplex systems of the secret service type.

The principal object of this invention is to provide a printing telegraph system whereby messages may be sent from one station to another in a code unintelligible to receiving operators at stations connected on the line for whom the messages are not intended.

A further object is to provide an eicient and reliable system and one which will provide a high degree of secrecy between authorized stations.

For the accomplishment of the above objects, the invention contemplates the employment of a five-unit code, consisting of positive and negative impulses, similar to the well-known Baudot code, except that the marking impulses, or the impulses required to operate the receiving mechanisms, are arranged in different code combinations for deach transmitter and each channel of communication. However, the invention is not limited to any particular code or to any particular kind of impulses. More specifically, one of the preferred forms of the invention as herein shown, comprises a full quadruple multiplex telegraph system arranged for eight channels of transmission with the transmitters and receivers so arranged that a message sent out by any transmitter can be received intelligibly by only one receiving mechanism or by the particular receiver for which the message is intended. For example, as illustrated in Figure 2 of the accompanying drawings, the live transmitter contacts of the transmitter connected to the first quadrant as shown developed, may be normally connected to -l- T; the transmitter contacts of the transmitter connected to quadrant #2, may be normally connected to -lthe transmitter contacts of the transmitter connected to quadrant #3, may be normally connected to -Q- -ietc., and the selecting magnets of the receiving mechanism connected to. the corresponding quadrants at the receivlng station may be arranged as shown so that the respective magnets will respond to the actuation of' the respective transmitter contacts. This arrangement provides a diil'erent code combination of signalingimpulses for each set of transmittin and receiving instruments. The transmltter contacts of each transmitter are so arranged that when the transmitters are idle, or when they are not sending message impulses, they will send no impulses over the line which 'will cause the operation of the selecting mechanism at the receiving stations. In other words, the transmitter contacts are normally connected to spacing battery.

The above and other features of this invention will be fully set forth in the following description and claims, and will be more readily understood by reference to the accompanying drawings, 1n which only so much of the system as is necessary for a complete understanding of the invention is shown diagrammatically.

Fig. 1 represents a multiplex telegraph system comprising stations A and B connected by a transmission line L; and Fig. 2 shows the sending rings of station A and the receiving rings of station B developed, with the sending segments connected to transmitter contacts and the receiving segments connected to selecting magnets.

At stations A and B are shown the wellknown types of rotary distributers which may be 'driven in any suitable manner as by a motor. The distributer 10 at station A consists of a pair of sending rings 12 and 14, a pair of receiving rings 16 and 18 and a trailer or brush arm 20. One ring of each pair is continuous and the other Segmented. The trailer arm 2O carries brush 22 for connecting the sending segments of ring 14 with the continuous ring 12, and brush 24 for connecting the receivingsegments of ring 18 with the continuous ring 16. The continuous sending ring 12 is connected-to the line L in the usual manner through a polar relay 26 provided with the usual duplex balance. The continuous receiving ring 16 is connected to a olechanging tongue 28 of relay 26. It 1s of course understood that the tongue 28 of line relay 26 is not operated by the impulses sent over the line from station A, but is operated by the impulses received over the line from station B. The distributer 110 and line relay 126 at station B are identical and function in the same manner as the corresponding apparatus at station A, and therefore no further description of the apparatus at station B is deemed necessary.

In Fig. 2 the four quadrants of the sending rings at station A and the four quadrants of the receiving rings at station B are shown developed. The sending segments of each quadrant are shown connected to transmitter contacts and the latter contacts are ,shown in their idle positions. The receiving segments of each quadrant are shown connected to the selecting magnets of the receiving mechanism and are arranged to respond respectively to changes in current po larity caused by the actuation of the transmitter contacts connected to sending segquently do not effect the operation of any of the selecting magnets at the receiving station. Let us assume for example, that the operator in charge of the transmitter connected to quadrant 1, desires to transmit the character A and also assume that the character A is represented by five impulses', the first two of which are marking impulses and the remaining three of which are spacing impulses. Then, to transmit the character A, transmitter contacts 30 and 31 of quadrant 1, would be actuated so that contact 3 0 is moved into engagement with tlie negatively poled contact, and transmitter contact 3 1 is moved into engagement with the positlvely poled contact, contacts 32, 33 and 34 remaining in the positions shown in engagement with the negatively poled contacts. Now as the brush 22 passes over. segment 40 and connects this segment With the continuous ring 12, a negative impulse is sent over the line L, which effects the operation of polar relay 126, thereby causing coritact tongue 128 to engage the negatively poled contact. Now if the distributers are rotating in synchronism. brush 122 will pass -over segment 140,-While brush 22 passes over segment 40 and a circuit will be completed from the negatively poled contactof relay 126, contact tongue 128, ring 116, brush 122, segment 140. magnet 130 to positive battery, thereby effecting the operation of the selecting magnet 130. Now when the brush 22 passes over segment 41, positive impulse `Will be sent from the transmitter 'through movable contact 31, segment 41,

brush 22, ring 12. line L, through the relay 126. This Will cause relay 126 to move the contact tongue 128 into engagement With the positively poled contact, thereby completing a circuit from said' positively poled contact, contact tongue 128, ringv 116, brush 122, segment 141, selecting magnet 131 to the negative side of battery. Current passing through this circuit will cause the operation of selecting magnet 131. Now since the third, fourth and fifth transmitter contacts have lnot been actuated, spacing impulses Will be impressed upon the iine L as the brush 22 connects the corresponding segments 42, 43 and 44 respectively With the continuous ring 12. Consequently the line relay 126 Will move its pole changing tongue 128 into engagement with the negatively poled contact and as the brush 122 Wipes over segments 142, 143 and 144 respectively,

circuits will be completed from negatively poled battery, pole changing tongue 128, ring 116, brush 122, segments 142, 143 and 144 and selecting magnets 132, 133 and 134 respectively to the negative side of battery. Since no current Will then flow through the windings of these magnets, the magnets Will consequently not be operated.

It Will be seen by reason of the fact that each group of transmitter contacts is adapted when operated to provide a different com bination of marking impulses, and the respective receiving mechanism being arranged to respond to the corresponding marking impulses regardless of polarity, no outside party or operator in charge of a transmitter connected' to another quadrant, would be able to decipher the message transmitted unless familiar With the code employed. Furthermore, if the distributers should for some reason get out of synchro nism and the impulses which are sent out by the transmitter connected to uadrant. 1, were, for example. received by t e receiving mechanism connected to the second quadrant at thereceiving station, they would be unintelligible to the receiving operator at that station by reason of the fact that the receiving mechanism at that station is arranged for receiving messages of a different code.

For example, assume as before that the character lA is tobe transmitted from the transmitter connected to quadrant 1 at station A and also assume that the same transmitter contacts are ,actuated as referred to above, namely, contacts 30 and 31, thereby placing contact 30 in engagement with negatively poled battery Vand contact 31 in engagement With positively poled battery. Now assume that brush 22 is passing over the five segments of quadrant 1 at station A, and brush 122 is passing over the corresponding five segments of quadrant 2 at station B.

As the first selecting magnet of the second quadrant has one terminal normally connected to the same polarity of current as the corresponding selectingmagnet of the first quadrant, that magnet will be operated in response to the first line impulses. sent out from quadrant 1, but since the second selecting magnet of qaudrant 2 has one terminal normally .connected to current of opposite polarity to that of the second selecting magnet of quardant 1, the second selectling magnet of quadrant 2 will not respond to the second impulse sent out by the transmitter from quadrant 1. Since the third, fourth and fifth selecting magnets'of quadrant 2 are connected in the same manner as the corresponding magnets in quadrant 1, and since the respective magnets of quadrant 1 were not operated by the third, fourth and fifth impulses sent out from the transmitter contacts when sending the necessary impulses representing the character A, neither will the corresponding selecting magnets connected with the second quadrant be operated. Therefore, if the impulses representing the character A are sent out from quadrant 1, and those impulses are received by a receiving mechanism connected to the second quadrant for which they were not intended, the impulses will not effect the operation of the two selecting magnets as in the former case, but will effect the operation of only the first selecting magnet. Accordingly the first magnet would be actuated, and the remaining four magnets would not be actuated which in accordance with the Baudot code would represent the character E Thus it will be seen that unless the message impulses sent out by a certain transmitter are received by the receiving mechanism arranged especially for their reception', they will be unintelligible.

The system herein described is believed to be efficient and reliable lin operation and to be suitable for any class of service wherein a high degree of secrecy is desired without employing expensive and complicated apparatus. This system is believed to be sultable for Government work, where the Government desires to carry on communication between -various departments without hav- ,ing the messages received and translated by persons for whom the messages were not intended. It is also believed to be suitable for brokerage work, where different brokers may each lease an arm or channel, and desire to carry on communication secretly and without having such messages become public or come into the hands of competitors.

What is claimed is:

1. In a telegraph system, a transmitting station and a receiving station, a current impulse distributer located at each of said stations, a transmission line connecting the said stations, transmitting means connected to means, and receiving means cooperating with A the other said distributer to record the respective code combinations.

2. In a telegraph system, a transmitting station and a receiving station, a rotary distributer at each of said stations, transmitting means connected to each quadrant of the transmitting distributer, each of said transmitting means being arranged to send the same characters by code combinations unlike those sent out by each of the other transmitting means, and a plurality of receiving means adapted to be associated sequentially with the respective transmitting means to record the'characters transmitted.

3. In a multiplex telegraph system, a transmitting distributer and a receiving distributer, a transmitter connected to each quadrant of the transmitting distributer, each of said transmitters being arranged to send the same charactersby code combinations unlike those employed by each ofthe other transmitters, and receiving means associatedwith the receiving distributer and adapted to be connected sequentially with the respective transmitting means to record the characters transmitted.

4. In a multiplex telegraph system, independently-driven rotary transmitting and receiving distributers divided into sections, a transmission line connecting said distributers, transmitting means connected to each section of the transmitting distributer each of said transmitting means being arranged to send the same characters by code combinations composed of equal numbers of units but unlike those employed by each of the other transmitting means, and receiving means coperating with the receiving distributer to record the respective code combinations.

5. In a multiplex telegraph system, aA

transmitting distributer and a receiving distributer, a plurality of transmitters connected to the transmitting distributer, each of said transmitters having a .plurality of contacts, some of which are normally connected to battery of one polarity and the remaining contacts to battery of opposite polarity, and each of said .transmitters being arranged to send the same characters by code combinations unlike those employed by each of the other transmitters, and receiving means coperating with the receiving distributer to record the characters transmitted. In witness whereof, I hereunto subscribe my name this ,13th day of November A. D.

PAUL M. RAINEY.

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