US361365A - Joseph w - Google Patents

Description

(No Model.)

J. W. LARISH. CALLING APPARATUS FOR TELEGRAPH CIRCUITS. w No. 861,365. Patented Apr. 19 1887.

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UNITED STATES PATENT OFFICE;

Josnrnw. rjArusr-r, E BUFFALO, :uEw YORK, Assreivon TO THE BALTL MORE AND OHIO TELEGRAPH COMPANY, OF BALTIMORE, MARYLAND.

CALLING APPARATUS-FOR TELEGRAPH-CIRCUITS.

SPECIFICATION forming part of Letters Patent No. 361,365, dated April 19, 1887.

\ Application filed July 31, 1886. Serial No. 209,613. (No model.)

To aZZ whom it may concern.-

Be it known that I, JOSEPH W. LARISH, a citizen of the United States, residing in Butfalo, in the county of Erie and State of New York, have invented'certain new and useful Improvements in Calling Apparatus for Telegraph-Circuits, of which the following is a specification.

The invention relates to the class of devices employed for attracting the attention of or calling up the operators upon telegraphlines.

The object of the invention is especially to provide means whereby the operator at a terminal branch office may attract the attention of an operator at a distant repeating station without calling upon the main office at the home station.

The invention consists in providing, at the station to be called, a harmonic reed or vibrator, and in locating at the point from which it may be desired to produce the call a harmonic transmitter tuned to the same pitch that the main-line connections are completed through this transmitter. A series of electrical impulses are thereby sent to line, and these vitalize the electromagnet of the receiving-instrument'with the proper frequency, and cause the harmonic reed to respond and to give a signal to the operator at that station.

The drawing is a diagram illustrating an organization of circuits adapted to carry out the invention.

Referring to the drawing, L represents a main line connecting two distant stations, A and A-for instance, New York and Buffalothrough a branch or repeating station, A The line L is equipped at the terminal stations A and A with a proper system of batteries, O and O and Withthe usual transmitting and receiving instruments, as.indicated at K and K and It and R At the repeating or branch office A,also,thcre is provided a transmitter and receiver, H.

For the purpose of attracting the attention of the operator at the Buffalo office-A for instance-without calling up the operator at the New York station A, there is placed in a adapted to vibrate with a given rapidity. The branch line 2, leading from a point, 1, in the main line, includes the coils of an electromagnet, (1, and leads to the armature e. The resting contact f of this reed-armature is connected by a conductor, 3, with a point, 4, in the main line L. The connections of the main line are normally completed between the point 1 and 4 through a switch or circuit-interrupting device, M, which may be moved so as to sever the connections and cause the main-line current to traverse the branch cir-' cuit, including the electro-magnet d. This magnet will then be vitalized and cause a series of impulses to be sent upon the line depending upon the tone to which the reed-armature is adapted to respond. Suchimpulses traverse, at the distant station A, an electromagnet, (1 provided with a reed-armature, e tuned to the same tone as the armature 6. These electricalinterruptions or impulses will cause the armature e to be set in motion, and thus give a tone attracting the attention of the operator at that station. It will be evident, however, that the armature 6 will not respond to the ordinary movements of the keys employed for working the instruments upon the main line.

I claim as my invention- 1. Thecombination, substantially as hereinbefore set forth, with a main line and telegraph transmitting and receiving apparatus,

of aharmonic transmitter, anormally-shunted branch circuit including the same, means for placing said branch circuit in the direct circuit of the main line, and a harmonic receiver responding to the electrical vibrations established by said harmonic transmitter.

2. The combination, substantially as hereinbefore set forth, with a main line and telegraph transmitting and receiving apparatus included therein, of a harmonic transmitter, a normally-closed shunt-circuit, a harmonic receiver at a distant station,tuned to the same pitch as the transmitter and included in the main-line circuit, substantially as described.

In testimony whereof I have hereunto subscribed my name this lith day of July, A. D.

JOSEPH V. LARISH.

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