US1021717A - Combined telephonic and telegraphic system. - Google Patents

Description

E. R. GILL. COMBINED TELEPHONIC AND TELEGRAPHIG SYSTEM.

APPLICATION FILED AUG. 5,1907.

' Patented Mar. 26, 1912 m1 TED sTA'i srATEnr OFFICE.

EDWIN R. GILL, 0F YO'NKERS, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS, TO HOWARD E. MERRELL, OF NEW YORK, N. Y., AND ORLO J. HAMLIN, OF SMETHLEORT',

PENNSYLVANIA.

To all whom it may concern:

Be it known that I, EDWIN R. GILL, a citizen of the United States, residing in the city of Yonkers, county of VVestchester, and State of New York, have invented a certain new and useful Improvement in Combined Telephonic and Telegraphic Systems, 'of which the following'is a specification.

This invention has especial relation to an improved system whereby any ,number of points along a telegraph line of indefinite length can be brought -rapidly into telephonic communication with any other, and

in such a manner as to cause no disturbance or annoyance to stations along the line not intended to be reached at the moment.

In railway practice particularly it often becomes important for a train despatcher,

for instance, to be able to reach some employee upon the hue and converse with him,

'so that conditions at or near the point where. the employee is located may be ascertained.

and orders givenaccordingly. Again many occasions arise when it becomes important for an employee somewhere along the line to communicate at once with headquarters un= de'r circumstances permitting rapid conversat-ion. been sought to establish a' telephonic system extending parallel to'the railway lines and terminating in the despatchers office, but the mode of construction and arrangement of such systems has hitherto been such as to I involve such a serious dissipation of electric energy, that, in practice, it has not been found possible to use more than a very limited number of instruments and the scope of usefulnessof telephones so used is therefore very restricted.

By the use of my present invention the number of instruments which may be used is without limit and at the same time conversation is perfectly clear. I accomplish this by providing at intervals along a telegraph line'.

on. At the same time, the relays at these stations, which are as' usual in series on the telegraph line, areprovided. with suitable bridging means, such, as condensers and h gh nonnductive resistances, which, wh1le To accom )lish this uroose it has' COMBINED TELEPHONIG AND TELEGRAPHIC SYSTEM.

' Specification of Letters Patent. Patented Mar. 26,1912. Application filed August 5, 1907. Serial m. 387,621.

afi'ording a pat h around said'relays for the 1 undulatory telephonic currents, do not divert the telegraphingcurrent from said relays. Each station is moreover supplied with a selective calling apparatus operated preferably by the relays, whereby any one station may be called withoutdisturbing any used afford such a serious obstacle to extend- T ed use of telephones.

An illustrative embodiment of-my invention is shown in diagram in the accompanying drawing which represents the equipment of atrain despatchers office and two distant statlons, united by a single telegraph line provided with my invention.

.The despatchers telegraphing and calling key is shown at 1, and near it is indicated the telephonic apparatus at the despatchers The main telegraphic line is indiofiice. cated at 2 and the main line battery at 3. ll hereVer desired along the line are placed relayset, in series with the main line and with each other and each relay 4 through an,

insulated back stop controls circuit through a local'battery 5 and the operative parts of a selective circuitcloser 6, whose terminals are at 7 andS. These devices act in any well known manner to close the circuit of a call bell 9 or equivalent device through terthey are so constructed in a well known manner that themormal use of the main telegraph w re 2 for ordinarytelegraphing is not interfered with by and does not itself interfere with operation of the selective devices,

At each station is placed a telephonic'outlit, the various outfits being in multiple are;

and, in the form shown this arrangement is produced by grounding each telephoneon It is to be understood that, although only three selective circuitclosers are shown/with their associated apparatus, any desired number' may be used 0 the same circuitfi In the preferrec harrangement:sh'own each,-

one side, while. itsother side is connected 41 'Wlilll the telegraph wire 2.

relay 4 is bridged by non-inductive coils of conversation circuit 1S closed from the telereceiver 7 and by the ground back to the line. 7

li ear the grounded ends of the main line choke coils are introduced to properly conthe telephonic currents.

' refer-to keep the telephone batteries nor lly out of circuit and to bring them into lrcuit automatically when the receiver is lifted. or this purpose I provide an insulated metal blade 20 on the rearof the lever 15, which blade is electrically connected shown with the transmitter 21.

The opposite side of this transmitter is connected to one pole of the local battery 22,

the other pole of which is connected to the primary coil 23 of the telephone transtoriner. The remaining terminal of said primary 001i .is connected to theconducting spring contact :24: whereby circuit is closed through the battery, transmitter and transformer primar-y Whenthe lever 15 is tilted'by the spring 16 on removal of the receiver.

In using the apparatus described, the key 1 is employed in. the usual manner to operate the particular selective circuit closer 6 at the station to be called. This causes the proper hell 9 or equivalent device to ring so as to attract the attention of the person called,1who thereupon lifts the receiver at his station, thus connecting his telephonic outfit With. the telegraphic line. The person callingphaving in the meantime raised his own receiver, conversation can be carried on between the two. As soon as the conversa tion terminates, both receivers are hung up and bothtelephonic outfits are once more out of connection with the line.

It isjto be understood that my inventiop covers any arrangement, whereby electrical connection between the telegraphic line and each telephonic outfit is normally broken and whereby this connection is produced at will when it is desired to use the telephone in high resistance 12, in multiple arc with cone through the branch Wire 18 of conversation. The arrangement above described has a decidedadvantage over multi le arc telephonic systems which include ca ling means in each telephonic branch, in thatthe dispersion of energy caused by the presence of these calling devices is avoided and it is therefore possible to greatly increase thenumber of telephones which can be used along a. single telegraphic line,

Whatl claim is- I 1. A telegraphic line in combination with a number of selectively operated signaling" devices at intervals along said line, phonic outfit adjacent to each signaling device normally disconnected from the telegraphic line, means for opcratively coinnct mg each telephonic outfit totlie' telegraphic line so that whentwo or more of said outfits multaneously connecting said receiver and transformer secondary to said telegraphic line and-closing the local transmitter circuit, and means for operating said selectively operatcd signaling devices over said telegraphic line, said last named means includ ing a circuit independent of all of said telephonic circuits, substantially as described.

3. A telegraphic line, a number of selectively operated signaling devices at intervals along said line, relays in series along said line for controlling said selectively op erated signals, condensers in shunt around each of said relays, a complete local telephonic outfit adjacent to eacn signaling device and normally disconnected from the telegraphic line and means for operatively connecting each telephonic outfit to the telegraphic line so that when two or more of said outfits are so connected they will be in,

' M. A. BUTLER.

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