US242311A - Telephone system - Google Patents

Description

(No Model.)

H. 0. H'ASKINS. Telephone System.

242,311. atented May 31,1381.

NITED STATES PATENT O I E,

HARRYO. HASKINS, OF MILWAUKEE, WISCONSIN.

TELEPHONE SYSTEM.

SPECIFICATION forming part of Letters Patent No. 242,311, dated May 31, 1881.

Application filed October 2, 1880.

T 0 all whom it may concern:

Be it known that I, HARRY O. HASKINS, of Milwaukee, in the county of Milwaukee, and in the Stale'of Wisconsin, have invented certain new and useful Improvements in Telephone Systems; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to the working of telephone-exchanges; and it consists in a system by which the operators in the central office may silently communicate with each other in their work of connecting and disconnecting subscribers with each other.

In the drawings, Figure 1 is a plan view of a Gilliland switch-board, and Fig. 2 a plan view of an operators table.

It has heretofore been one of the great obstacles to the successful working of telephoneexchanges that the announcement, orally and by writing, of the connections and disconnections has been accompanied by a great deal of confusion; and the object of my invention is to overcome this, which I do as follows, illustrating by a Gilliland switchboard: This switch-board I place in the operators room of the central office, connecting it with the table by wires I K. Upon the table I place an annunciator, A, into which wire K enters, the wire 0 connecting the annunciator A with switch B, which turns on a vertical axis or pivot to connect the annunciatorA with either of buttons to b. A wire, H, extends from button b to target G on annunciator E, and when this target is set or in its raised position it'is connected with the electrical power F through spring S and wire G, the power F being suitably grounded. Line I simply passes from the switch-board to button a and plate 0.

The generator Y is connected, when desired, with annunciatorE by line 0, key D, and line L, and aununciator E is grounded by wire or line E.

Just above the annunciator E, which in practice I propose to arrange just over the switchboard, I attach by a suitable bracket, 1%, a spring, S, and this spring, when the target is set or in its raised position, will complete a circuit with the annunciator A from the electrical generator 13 when the switch B is on but ton b, and through it to the switch-board.

(No model.)

The operation of my device is as follows: No. 4 desiring to communicate makes the usual call on central office, and, being answered, says Connect me with No. 5. The operator at the switch-board will then insert connectingplug P at the intersection of line 4 with strip 0, and plug P at intersection of line 5 with strip 0', thus completing a circuit which, starting from earth, passes through generator F, line G, to spring S, target G, line H, to 1), across switch B, through annunciator A, and through line K, to end of strip 0. Now the generator F is in circuit and givesthe alarm at station on line 5, the passing current having caused As target to drop, notifying the operator at table of the connection. The operator then moves the switch B to button a, which places lines 4 and 5in direct communication with each other and cuts off the callingpower. The operator at the table will now wait for the parties to indicate that they are through talking by giving a disconnecting-signal, or he may connect his local telephone with plate 0 and listen for the cessation of the conversation, and when this occurs he presses upon key D, completing the circuit from generator Y through line L to E, causing the target G to fall and break connection with power F, the fall of the target also notifying the boy at the switch-board that the plugs may be taken out and 4 and 5 disconnected. This he does, and then sets the target G, seeing which the operator at table turns the switch B back to I), thus again putting the calling-power in readiness for another connection.

I use an annunciatior, E, for each pair of horizontal conducting-strips a a B B G O.

W represents a local telephone of the ordinary construction, grounded as usual. X is a wrapped wire depending therefrom and terminating in a metallic plug, which, when the operator places it upon the plate 0, will bring the local telephone in circuit with the lines I and K and enable the operator to ascertain when the conversation is at an end, so that the operator may by pressing upon D complete the circuit from Y to E through line L, causing the target G to drop.

I am aware that I am not the first to have connected the switch-board plates in pairs with an operators table provided with an apparatus 7), plate 0, and lines connecting them with the switchboard.

8. The combination of generator Y, key D, annunciator E, having target Gr, spring S, and battery-power, with the button 1), connectinglines, and annunciator A, as set forth.

In testimony that I claim the foregoing I 20 have hereunto set my hand this 24th day of September, 1880.

HARRY G. HASKINS. itl'lessesz S. S. STOUT, Gus LIPMAN.

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