US326892A

US326892A - Beeghe

Info

Publication number: US326892A
Authority: US
Publication date: 1885-09-22
Anticipated expiration: 1902-09-22

Description

(No ModeL) F. VAN RYSSELBERGHE. MEANS FOR PREVENTING FALSE SIGNALS ON REVERSALS IN QUADRUPLEX TELEGRAPHS.

No. 326,892. Patented Sept. 22, 1885.

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MEANS FOR PREVENTING FALSE SIGNALS ON REVERSALS IN QUADRUPLEX TELEGRAPHS.

SPECIFICATION forming part of Letters Patent No. 326,892, dated September 22, 1885.

Application filed May 18, 1885.

T0 at whom it may concern:

Be it known that I, FRANooIs VAN RYssEL- BERGHE, a subject of the King of Belgium, residing at Schaerbeek, Belgium, have invented new and useful Improvements in Means for Preventing False Signals on Reversals in Quadruplex Telegraphs, of which the following is a specification.

My invention relates to a system of telegraphy in which two independent signals or sets of signals may be simultaneously transmitted in the same direct-ion over a single electric conductor.

The invention consists in improved means for avoiding the false signals which are produced upon the ordinary receivi rig-instrument of a quadruplex telegraph by changes in the static condition of the line when the ptlarity of the current is reversed during the transmission of the signal.

In the accompanying drawing are illustrated my arrangements of circuits and instruments for preventing false signals or reversals in a quadruplex telegraph.

The drawing shows the instruments located at one station of an ordinary quadruplex telegraph. They consist of the main battery 1, the Stearns transmitter 2, the signals of which are interpreted by the neutral relay 3, and the pole-changing and circuit-preserving transmitter 4, the signals of which are interpreted by the polarized relay 5, having the armature 5, acting against the front and rear stops, 5" 5. The above parts, being of the ordinary construction, need no further explanation.

It is well known that when in the sendingstation of a quadruplex telegraph the polechanger is operated there will be an instant at each reversal when there is no current upon the main line; and since this occurs while the armature 6 ofthe neutral relay 3 is being attracted at the receivingstation the spring draw for an instant the armature-lever 8 toward the stop 9 and cause the production of afalse signal. In order to prevent this, 1 com bine with the ordinary neutral relay 3 an ad ditional electro-magnet, 10, which acts upon an additional armature, 11, fixed on the lever 8, bearing the armature 6 of the neutral relay. NVith said additional magnet 10, I combine any electrical contrivanee or devices capable (No model.)

of sending through the circuit of said magnet an instantaneous current at the very moment of the reversal of the current in the main line, ifat the same time the lever of the neutral relay is in contact with the stop 12.

Various means may be resorted to for send ing a current through the additional magnet, and in the drawing I have shown for such purpose a condenser, 13, an additional relay, 14, and alocal battery, 15. The circuit of the latter is closed, first through the additional electromagnet 10, and next through the armaturelever 16 of the additional relay 14, said lever making a short circuit when it remains in contact with the stop 17, and preventing in this manner the action of the local battery 15 upon the electroniagnet 10. Upon each reversal of the current in the main line 18, the charge of the condenser 13 being reversed, an instantaneous current goes through the electro-n1agnet of the additional relay 14, and the armature of the latter being then attracted for an instant, the lever 16 of said armature is for an instant not in contact with the stop 19, and the short circuit being thus broken the battery 15 acts for an instant upon the additional electro-magnet 10 just at the very time when the ordinary electro-magnet of the neutral relay 3 becomes momentarily inoperative by reason of the reversal of the current in the main line.

It is readily apparent that the additional electromagnet 10 replaces the ordinary electro-magnet of the neutral relay at the time when the latter becomes momentarily inactive, and for this reason the production of false signals on reversals is effectively prevented. The advantages of my system are due to the following facts, viz: It is well known that, notwithstanding the very high velocity or speed of electricity, the action of a current occurs not exactly at the same time or moment in all the parts of the circuit. For instance, when the transmitting-key places the circuit in connection with the battery, the beginning of the circuit is influenced before the end of said circuit, and while the dilference of time may be exceedingly short such a difference really exists. Thus when the transmitting-station reverses the current this influence will first be perceived at the point 21, then in the polarized relay 5, and, finally, in the electro-magnet of the neutral relay, and at that very moment the armature-lever 6 will have a tendency to escape. It is just at this moment that the additional electro-magnet 10 must come into action. Were it to operate an instant before or after it would itself be the source of a false or altered signal.

Experience has shown that the combination and arrangement of parts seen in the drawing serve most perfectly to prevent false signals, this being due to the presence of the additional magnet 10, which acts only at the very moment when its services are required, and at no other time.

As above stated, the reversal of the current is first perceived at the point 21, and before reaching the electro-magnet of the neutral relay it has to go through the polarized relay 5, these being the conditions with the current starting in one way from the point 21. In the other way it is evident that before the effects of the current can be perceived in the additional magnet 10 it must act upon the condenser 13, then upon the additional electro-magnet 14; and since it takes exactly as long for the reversed current to travel in the two directions the local current from the battery 15 will have time to act upon the additional electro-magnet and prevent the production of a false signal.

The ends of the circuit of the condenser 13 and the electro-magnet oftherelay 14 are shown in the drawing as being connected, respectively, with the ground at the point and with the main line at 21; but they may also be connected with the main line at the point 22 and with the artificial circuit at the point 23.

My invention is not necessarily confined to quadruplex telegraphy, since it may be used in connection with multiplex telegraphy by making the proper adaptation of parts.

Havingthus described myinvention, What I claim, and desire to secure by Letters Patent, 1s

1. In a multiplex telegraph for preventing false signals on reversals, the combination, with the main line and ordinary neutral relay located therein, of an additional electromagnet, an armature-lever common to both the additional electro-magnet and ordinary neutral relay, a local battery, and an additional relayconnected with themain line, and adapted to control the circuit-connections of the local battery and additional electro-magnet, substantially as herein set forth.

2. In a multiplex telegraph for preventing false signals on reversals, the combination, with the main line, of an additional relay, a condenser separating said main line and additional relay, 2. local battery, the ordinary neutral relay, and additional electro-magnet, the latter being included in the circuit of the local battery,the additional relay serving to control the circuit connections of said local battery and the additional electro-magnet, substantially as shown and described.

In testimony whereofI affix my signature in presence of two Witnesses.

FRANQOIS VAN RYSSELBERGHE.

\Vitnesses:

T. BERTIN, EDWD. H. CLOUD.