US1244477A - Telegraphy. - Google Patents

Description

P. B. DELANY.

TELEGRAPHY.

APPLICA'HON HLED DEC-21. l9l6.

Patented Oct. 30, 1917.

2 SHEETS-SHEET l.

P. B. DELANY.

TELEGRAPHY.

APPLICATION FILED 050.21. 19m.

1,244,477. Patented 00th 30,1917.

2 SHEETS-SHEET 2.

Befit knownthat I, PATRICK 13..DELANY,

transmitted. v a

The principal object fof the present in- 3o dinarily employed and so positionedin g" relation to the general. public that s gnals recorded thereby predo'minatefin i 011 mdiIIsO im F a 1 AYfurther object 'otmy invention is to ovide a safeguarding sounder o tlthe 'naturereferred to which shall recordreversals iof the signalsrecorded bythe I nainreceivinginstruments.

i a In the accompanying drawings,

E lis a diagrammatic View illustrating; one I "form ofj'niv invention. a

Fig. 2 is a'diagrammatic view ofaslightly modified formr,thereo t. Q a i Fig. 3 "s a diagrammatic-view "of a furherljnodification. y v

i Fig. dis-a diagrammatidview of amec anically operated sounder. l

3:15 is a perspective vlewshowing a ossiblearrangement of instruments. I

Withsystems now in [use for receiving egraphicniessages within hearing of the nerallfpublic, such asin branch oflicesof tels, ,otfice buildings andflthe like, it is coinbaratively easy for an outsider who has 5 a knowledge of telegraphyfto get within hearing fdistance of, the receiving instru- 1 merits and read the message bein'g. transmit- 45; teder receivedat sucho'fiice. While the'disadvantages of such publicity have long been recognized, it has, so far as I know,'neyer en lgr emed e exam by st li th i 1 flstrunients in a separate room. It often happens that due to the limited Space provided it is almost impossible to setjaside "stems ordinarily eniployed, and j to fmethod offlreceiving the signalsor messages nt'ion is to provide a safeguarding sounder merits. a

dness verfthe signals recorded by'the h room. It is the purp osedof'the; p 'resvention to overcome these ob ect1ons mate large? extent thekl als a STATES "PATENT OFFICE.

PATRiCK BQij LA Y, or some c imes, 'NEw JERSEY, ASSIGNOR o sEcRE'r TELEGRAPH COMPANY, OF NEW YOBK, N,Y., A CORPORATION or DELAWARE.

i V TELEGRAP i i Specification. of Letters lP atent. l Pfijjnfed'OQig, 30, 191 7; Appl i cati orifiled Deceniber 27,"1e1e, s em. 139,103. i

supposedly private messages; Thisisaceompli'shed by providingwhat may be termed a supplemental or safeguarding sounder for use in connection with the main receiving Sounders or instruments now in use, and placed; within hearing distance of the public, and controlling the operation thereof either from s'uch'infstrunients, or by independent mechanically operated devices. This may be successfully done by causing the vibratingmernber of the safeguarding sounder to record. signals conflicting with the signals received by; the main] instru- Referring now more particularly to Fig. 1 of the drawings, Ihave shown a relay R in circuit with the line wires Land adapted to controlthe operation of the main receiving instrument or soundens in the usual manner. Vith the main line circuit open, which is the conditioniwhich exists just prior to' thetransniitting of a message, the

armature '1 of the relay will bejdra'wn by the spring 2 into whatis normallyits in]- operatlve position, whichposition is indicated in full lines in the drawing. In the present system advantage is taken of this position forcontrolling the actuation of the supplemental or safeguarding SounderfSS in the manner hereinafter described. .Upon

theclosing of the" sending key, the relay will hefe'nergized thereby attracting its, ar-

fmatur'e, against the action of the retaining spr1ng,into electrlcalcontact with the point 4. This will in turn close the local circuit of the sounder S from the point 4, through the wire 5 to the sounder, and thence from the Wire 6 and battery B to the relay armature through'the wire7., This causes the v armature 21of the sounder to be attracted in the usual mannerfor recording the "signal transmitted. Upon the opening of thesending key, the relay armaturewill again resume the full line'position,fthereby closing the circuit through contact 8, wire 9 and switch 10 to the safeguard lng sounder, the

opposite side' of the circuit being completed through thef wir'e 11 and battery B as "before described. ltkwill thus be seen that upon its backrs'trokelthe relay armature line lsounder,ithe ,circuit[ of which is closed "closes the loealflcircuitoif thevsafeguarding sounder. thereby causnigithe "same (to give reversals of theslgnalsireceived by the main dis bin onin eri' 11 11622 Lbfthe sounder armaqlli ently vo'f'thbprati'on, of 1th instance provided with 'a 'bufi'er jorubfitton of 70 v While I have illustrated the preferred jmanner of carrying out the foregoing obgjects, it .Will be apparent that changes may be made in circuits and connections illus- 1 trated Without departing from the spirit of C the invention and scope of the appended claims. 1 U

i What, I claim is ,1. A system for protecting the secrecy of ing sounder, a safeguarding sounder, and

telegraphic messages, comprising a receivmeans for causing said safeguarding sounder to give telegraphic reversals of the signals rece ved by thereceivmg sounder.

1 A system for theprotection of telegraphic messages,-comprising receiving instruments mcluding a relay and a teleigraphic soundercontrolled thereby, and a messages, comprising receiving instruments including a telegraphic sounder, and a relay having an armature controlling the opera- 2 5 tion of said sounder upon movement in.

safeguarding telegraphic sounder controlled 2 0116x016 said receiving instruments.

"A system for protecting telegraphic one direction, a safeguarding telegraphic sounder, and means for operating said safeguarding sounder upon movement of the relay armature in the other direction.

comed c! this patent may be obtained {or 4. A'system forprotecting the secrecy of a telegraphic message, comprising a receiv-' ing station,;a private operators sounder at said station, and a public safeguarding sounder, both of said sounders being adapt- "edlto produce telegraphic signals through- V out the time said message is being received.

producing a series of signals similar in nature to but interfering in sound with the signals comprising said message to confuse a bystander attempting to read the same.

In testimony whereof, I- have hereunto subscribed my name.

A PATRICK B. DELANY.

five cents each, by addressing the Commissioner of Patents, Washington. D. G."

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