US963062A - Secret telegraph system. - Google Patents

Description

w. P. PHILLIPS. SECRET TELEGRAPH SYSTEM.

APPLIOATIONTILED NOV. 8, 1909.

Patented July 5,1910.

flu ATTORNEYJ- WALTER IOLK PHILLIPS, F BRIDGEPORT, CONNECTICUT.

SEGB ET TELEGRAPH SYSTEM.

' To all whom 'it 71?, y concern."

, a result may Be it known t at I, WALTER P. Pnnmn's, a citizen of the United States, residing at Bridgeport, in the odunty of F airfield and State of Connecticut, have invented certain new and useful Improvements in Secret Telegraph Systems, of which the following is a full, clear, and exactdescription.

In the transmission of messages bythe common system, in which the messages are received by a sounder, it 1s posslblefor any .person who is able to read Morse signals by sound to overhear the messages as they are received or transmitted, and important con1- munications, which under the circumstances can not be coded, are thus in effect trans mitted with full, publicity instead of being sent in secrecy. In fact, improperuse, has repeatedly been made by unscrupulous persons of information thus obtained, and such.

happen in any case when for any reason the message cannot be hrst trans:

'lated into a private code.

My present invention is designed to avoid this defect, and has for ts chief ob ect to provide simple and effective means whereby the messages, although transmitted in ordinary Morse and without being coded, Wlll be y'utterly unintelligible to a Icy-stander and yet perfectly intelligible to the sending and receiving operators. n

To this and other ends the-invention consists in the novel features and combinations of elements hereinafter described, and more particularly pointed out in the appended claims. A convenient embodiment of the invention is illustrated in the annexed drawing, and. referring now thereto, Figure} 13 a plan view of the apparatus constitutingeastation Set, con'nrising sending and receiving devices. 1g. 2 is a diagram showing the wiring of the system;

The apparatus at each station consists essentially, in addition to the usual key, 1, of a Morse sounder, 2, and a telephonic receiver, 3. The sounder may be of the ordi--' nary kin d, on a local circuit, but in the presemploy what is commonly ent embodiment I connected known as a line sounder, being directly to the line without the interposition of a relay. In either case, however, one Stop or contact of the sounder, and o the. rela also where the same is used, 1s made (lea or silent by substituting a stop ofsoft Specification of Letters laten t.

with the greatest ease.

Patented July 5, 1910.

Application filed November 8, 1969. Serial No. 528,761.

nection with the telephonicreceiver 25. The

latter may be of anyconreuieut type, such, for example, is. used in wireless teleg;v

raphy. I

9 is an ordinary two-point switch, mounted preferably on the same base a's'the key and sounder.

The wiring is SllU'Wl'l in Fig. 2, in which it will be seen the sounder and the telephonic receiver are in parallel, and that either may be cut out, while switch 9.

Normally, when the statibn is neither sending nor receiving, the switch 9 is on point 10, (with the keysswitch it closed), and it will therefore be seen that theline current, entering say at binding post (3, througl'i wire 12-, key 1, switch 9, sounder 2, and back to line through binding post 5. It will also be evident that; as the circuit is opened and closed atsome other station the signals produced by the sounder 2 will be imperfect or mutilated since only the back stroke of the armature will produce a sound, the forward stroke falling noiselessly on the rubber pad or stop 4, Such mutilated sigthe otheris cut'iu, by the tiows nails of course cannot be read by a by stander. Supposenow that the station is called. The operator, having quickly and easily learned to recognize his call as' received by the mutilating sounder, at

once throws the switch 9 over to point 13,

thus cutting out the sounder and causing the current to flow from binding post 6, wire 12,

post 7'back to the line. The sounder is thus idle, but in the telephonic receiver the operator can hear and read the Morse signals In sending, the operator can leave the switch 9 ineither position, but preferably puts it'on point 1.3 so as to out out the sounder.

From the foregoing it will be seen that the messages intended for the station are delivered directly into the receiving operators ear, and that at .every other similarly equipped station the signals are locally mu tilated at the sounder so asto be wholly unintelligible to the bystanders, but without beingin any way affected so far as the line is concerned. In this Way complete secrecy is assured, no one but the line operators being able to get the full signals.

The embodiment herein specifically shown and described is convenient and thoroughly effective, but it is to-be understood that the invention can be embodied in other forms without departure from its pro er spirit and scope as defined by the app'en ed claims.

$12 sw1tch, a Morse key ha vlng one terminal What I claim is: p

1. In a system of telegraphy of the kind described. for the secret transmission of messages, a receiving instrument of the sounder type having a dead or silent arn'iature-stop, whereby signals received thereby will be enunciated in fragn'ientary or mutilated silent armature stop', a receiving instrument of the telephonic type connectedin series with the line and in parallel with the firstnamed instrument, and a switch for cutting filtfiel' instrument into or out of the line at W1 4 3. In a system of telegraphy of the kind described for the secret transmission of mesa transmission line, a two-point connected to the line and the other to the switch, a receiving instrument of the sounder type having a dead or silent armature-stop and having one terminal connected to the line and the other to one of the points of said switch, and a receiving instrument of the telephonic type having one terminal connected to the line and the other terminal to the other point of said switch, whereby either instrum nt may be connected to the line in series with the key.

A. In a system of telegraphy of the kind described for the secret transmission of mes sages, a station set comprising a Morse key,

and receiving instruments in parallel, one of ,sages, a station set comprising a receiving instrument of the sounder type having a dead or silent arniature-stop whereby signals received thereby Wlllbfi enunciated in mutilated or fragmentary form, a receiving. instrument of the telephonic type a Morse key, and a switch for connecting either instrument in series with the key at will.

6. In a system of telegraphy of the kind described for the secret transmission of messages, a transmission line, a mutilating receiving instrument for receiving Morse signals, and a telephonic receiver in'parallel with the former. i I.

In testimony whereof I affix lily-signature in the presence of two subscribing Witnesses.

WALTER PQLK PHILLIPS.

Witnesses: 4

C. W. HEDBERG, N. B I ns'rrrnr.

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