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Publication numberUS286282 A
Publication typeGrant
Publication dateOct 9, 1883
Publication numberUS 286282 A, US 286282A, US-A-286282, US286282 A, US286282A
InventorsPatrick B. Delany
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Patrick b
US 286282 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)



Patented 001;. 9, 1883.



SPECIFICATION forming part of Letters :Patent N0. 286,282, dated October 9, 1883.

Application filed August B, 1883. V(No model.)

in rlelegraphy, oi' which the following'is a' specification.

The object of my invention is'to provide an organization in which the relay at the transmitting end of a telegraphic circuit, where a split ,battery and Currents of opposite polarity are alternately sent to line, is cut out of the circuit when the transmitting electrical impulses are sent into the line, but is thrown into the line before each completion of the battery-circuit. By 'this arrangement it is not necessary, in transmitting, to work through the relay at the transmitting-station, and yet the operator at the receiving-station may stop or break 7 the operator at the transmitting-station whenever desired. The primary advantage of such a system of transmission is that the resistance 'of the relay at the transmitting-station is taken out'of the line, andat the Sametime the eX- tra induced currents from the core and helices of the relay are also kept out of the circuit.

Another feature of considerable importance incident to my improved arrangement is that the line at the transmitting-station is put to ground before each reversal of the battery-circuit. This eliminates from the line any static disturbances, and consequently very much improves the condition of the circuit for transmission.

rangement at one station..

The transmitting-hey vA is placed in a local circuit containing a magnet, A, which actuates an armature, B, which vibrates between two adjustable stops, b,whieh are electrically connected with the opposite poles of the battery lli B, which is grounded in the middle.

The main line L may, by means of a switch, Z, be placed in connection with the armature 'B through the line Z when the apparatus 'is arranged ior transmission; orthe main line may be connected with a lin'e, Z2, which passes through the relay to earth for reception. A spring-arm, C, secured on a suitable post and controlled by an adjusting-screw, is connected with the line Z2, between the relay and the main line. The end of this spring-arm carries a wedge-shaped projection| which lies in the path of the wedge-shaped end of the vibrating armature B, so that as this armature moves lfrom one stop Z to the other it momentarily completes the circuit from the armature through the spring C, line Z2, and relay to ground. With the switch put over to the right, so as to throw the relay into the main line for receiving a message, the operation is common and well known. Vith the switch put over to, the left, however, when the key is worked, the armature B will be vibrated, and will alternately send currents of opposite polarity into the main line. Between each completion of the circuit, however, fthrough the armature B and the contact-pieces b b, the relay R is thrown into the main line through the wedge-'shaped projection e and arm C. Although the relay is included in the main-line circuit for a very' brief period, it will respond to a signal from the receiving-operator at the distant station to stop or break the transmit ting-operator.

The invention is obviously applicable to the various systems of telegraphy, whether of single or multiplex transmission, and whether synchronous or not.

I -claim as my inventionl. The combination, substantially as set forth, ofthe main line, the split battery, the vibrating transmitting lever `or armature, which alternately puts the opposite poles of the battery to the main line, a relay which is not included in the main line when such trans mittingimpulses of electricity are sent 'into it, and means for momentarily including the relay in the main-line circuit aftereach impulse Y which is not included in theline When transmt- In testimony whereof I have hereunto subting-impulses are sent into the line7 and ayeld- Soribed my name this 8th day of August, A. ing Contact connected with the ground', which D. 1883.

normally proj eets into the path of movement of 5 the transmitting-lever, and is struck by the le- 4 PATRICK B DELANY ver as it passes from one pole of the battery to Vitnesses: the other and momentarily puts the line to E. C. DAVIDSON ground through the relay.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6567522 *Apr 20, 1999May 20, 2003Godigital Telecommunications, Inc.Voltage alternating switch circuit
Cooperative ClassificationH04L12/00