US781873A - Wireless telegraphy. - Google Patents

Description

No. 781,873. PATENTED FEB. 7, 1905.

P. B. DELANY.

WIRELESS TELBGRAPHY.

APPLICATION FILED JULY 10. 1903.

mun- T UNTTED STATES Patented February '7, 1905.

PATENT Orrica WIRELESS TELEGRAPHY.

SPECIFICATION forming part of Letters Patent No. 781,873, dated February '7, 1905.

Application filed July 10,1903. Serial No. 164,998.

To (1N 7071mm it may con/c7714 lle it known that I, PATRICK B. DELANY, a citizen of the United States, residing at South Orange, county of Essex, State of New Jersey, have invented certain new and useful Improvements in ll'ireless Tlelegraphy, of which the following is a specification.

r I n I o l The ob ect of this invention 1s to make more certain, delinite, and distinct the manifestation of received signals in wireless telegraphy.

To this end the invention comprises an organization wherein when the primary-receiver or variable-resistance device subject to received waves or impulses has acted to control or vary a local circuit, and thereby cause the actuation of a relay or electromagnetic secondary receiver, the winding of the latter device is cut out or shunted from normal local circuit, so that its movable part or armaturelever is entirely free to return to its normal position. Such an organization permits of a lower tensional adjustment, and consequently a more sensitive or delicate adjustment of the relay-armature lever, and obviates certain sources of imperfection of reception ordinarily encountered in wireless telegraphy as now in practice, due more or less to unequal behavior of the primary or variable-resistance receiver device, and to the necessity for maintaining a comparatively strong retractile bias on the armature to pull it to its open position against the lingering attractions remaining in the relay after a signal has been received.

The shunting of the winding of the relay from its normal local circuit may be accomplished at the armature-lever of the deco herer-magnet or the armature-lever of another electromagnetic devicein circuit with the decoherer-magnet. The relay may be the linal receiver from which the signals are to be read by sound, or it may control directly or indirectly a second relay or electromagnet, which in turn controls a local circuit containing a iinal receiver or relay for retransmission into another circuit.

\Vith a system such as that above indicated the relay may be made to respond accurately to each of the several impulses making up a signal wave or impulse and representing either a dot or a dash, and the invention further comprises a means whereby such separate dis tinct impulses of a group or series representing a dot or a dash and the correspoinling movements of the armature-lever of the relay may be reproduced by an appropriate rccorder in the formof a solid line or mark rcpresenting either a dot or dash, as the case may be.

This invention, as illustrated. employs a coherer or primary-receiver device in which the resistance is lowered on the passage of a signal wave or impulse; but the invention is not restricted to the employment of a primary-receiver device of this character.

In the accompanying drawings, liigure 1 is a diagrammatic view illustrating one arrangement or embodiment of the invention. Fig. 2 shows a modilied organization, and Fig. 3 shows a section of receiving-tape with the dots and dashes recorded thereon.

On the passage of an electromagnetic wave or impulse through the coherer a, lowering resistance of the circuit containing the relay 1), the armature (1 thereof is attracted to its front stop (I. The circuit. of relay 1) is provided with the usual choke-coils I} w and with resistances f f", respectively, on opposite sides of the local battery \Vhen the armature-lever comes against its front stop (7, the circuit /1. containing the local battery la and including the coil of the tapper or decoherer-magnet is completed and thearmature-lever A of the latter magnet, which carries the coherer, is attracted. Normally or when the armature-lever A is against its back or upper stop a shunt-circuit 1/ around the resistance 1*" is closed, and therefore when the armature-lever Z leaves its back stop I this resistance is let into the local circuit of the relay b, and when the armature-lever fi' reaches its front or lower stop 0 a shunt-circuit 1) around the coil of the relay 7) is closed. The letting in to this local circuit of the resistance compensates for shunting the winding of the relay out of the circuit, thereby maintaining the normal resistance of this circuit, resistance of the relay-wimling and of f being equal, or substantially so.

The winding of relay 6 being shunted from the local circuit, the armature 0 is no longer attracted and returns readily under the influence of its retractile spring to normal position. At the same period the local circuit 72 being opened at the contact (Z armature-lever Z. is permitted to return to its back stop, and resistance f is cut out of the local relay-circuit. Obviously with this arrangement the retractile spring of the relay 6 may be very delicately adjusted and still be suflicient to promptly return the armature-lever to its backward position whenever the winding of the relay is shunted from the circuit that is, whenever the armature-lever of the tapper or decoherer-magnet passes to its front stop 0. Under such conditions the armature of relay 5 is attracted by a very slight increase of current through the coherer and is therefore extremely sensitive.

In the organization illustrated in Fig. 2 an electromagnet is connected in parallel with the tapper-magnet An insulated contactfinger 7' on the end of the armature-lever oz. of this magnet plays between contact-stops r r, the former of which is connected with the local circuit of the relay between the chokecoil E and resistance f and the latter with one side of the winding of the relay 6, while the insulated contact-fingerjis connected with the local circuit of the relay between the resistance fand the relay, or, in other words, with the other side of therelay-winding. It is apparent that the operations described in connection with Fig. 1 occur. One advantage of this arrangement is that an independent adjustment of the armature-lever of the tapper is afforded as well as an independent ad justment of the conditions controlling the circuit connections of the relay 6 and resistance f. In this Way the opening of the shunt around the resistance f and the completion of the shunt around the relay 7) may be made relative to the movementof the tapper armature-lever, it being thought desirable that the apparatus should be so adjusted that the movement of the lever a will be somewhat slower than that of the tapper-magnet. The armature-lever 72. plays between stops 3 t, and thereby, when attracted and retracted,closes and opens a local circuit a, containing a local battery 7) and having connected with its terminals the styluses 20 :0 of a chemical recorder, of which 9 is the drum or surface over which the chemicallyprepared receiving-tape 2 passes. The capacity of this local circuit is increased by placing a condenser 2 in a bridge connection between the two sides of the circuit. The capacity so artificially added to the local recordercircuit may be such that the individual dots composing a dash will, because of tailing of the current, be represented as a continuous or solid line. This is indicated in Fig. 3, which shows a section of a tape .2 containing a dash, a dot, a dash and a dot. Each dash is supinstance, assuming the grouping of the impulses to be as indicated in Fig. 3, there would be four vibrations of the armature of the relay during the reception of a dash and two during the reception of a dot, and, as stated, such vibration would be maintained with uniform rate or with substantial uniform regularity regardless of variations of conditions in the coherer that would ordinarily prevent or impair the regularity of responsive movement of the relay-armature.

I claim as my invention I 1. In wireless telegraphy, the combination with a primary-receiver device and relay controlled thereby, of means for shunting the relay-winding each time that its armature-lever moves from normal to signaling position.

2. In wireless telegraphy, the combination with the primary-receiver deviceand relay controlled thereby, of an instrument in a local circuit controlled by the relay and a shunt around the relay closed by said instrument each time the armature-lever of the relay is moved from its normal or inactive position.

3. In wireless telegraphy, the combination with the primary-receiver and relay controlled thereby, of a resistance substantially equivalent to that of the relay-winding and means for introducing such resistance into the local circuit of the relay and cutting out the winding of the relay each time the relay-armature lever is moved from its normal or inactive position.

4. In wireless telegraphy, the combination of the coherer, the relay and its circuit, the tapper-magnet whose circuit is controlled by the relay, a second magnet whose circuit is also controlled by the relay and means, under the control of the second magnet, whereby the winding of the relay is shunted from its circuit each time that the relay-armature lever is moved from its normal or retractive position.

5. In wireless telegraphy, the combination of the coherer, the relay and its circuit, the tapper-magnet whose circuit is controlled by the relay, a second magnet whose circuit is also controlled by the relay, means, under the control of the second magnet, whereby the winding of the relay is shunted from its circuit each time the relay-armature lever is moved from its normal or retractive position and a local circuit containing a receiver and also controlled by said second magnet.

6. In wireless telegraphy, the combination of the primary-receiver device, a receiving-relay controlled thereby, a resistance substantially equal to the winding of the relay, the tapper-magnet whose circuit is controlled by the relay, a second magnet whose circuit is also controlled by the relay and means whereby, on the energization of the latter magnet. the said resistance is introduced into the local circuit of and the winding of the relay cutout from the local relay-circuit.

7. In wireless telegraphy, the combination of the primary-receiver device, a receiving-relay controlled thereby, a resistance substantially equal to the winding of the relay, the tapper-imignct whose circuit is controlled by the relay, a second magnet whose circuit is also controlled by the relay, means whereby on the encrgization of the latter magnet, the said resistance is introduced into the local circuit of, and the winding of the relay cut out from the local relay-circuit, and a local circuit containing a receiver also controlled by said second magnet.

S. In wireless telegraphy in which a signal wave or impulse representing a dot or a dash is composed of two or more oscillations or impulses, the combination of the primary-receiver device ati'ected by such signal-wave, a

relay in the local circuit of and controlled by said device and local means for automatically causing the vibration of the relay-armature once for each oscillation or impulse of a group representing a dot or dash.

9. In wireless telegraphy in which a signal wave or impulse representing a dot or adash is composed of two or more oscillations or impulses, the combination of the primary-receiver device ati'ected by such signal-wave, a

relay in the local circuit of and controlled by said device, local means to r automatically causing the vibration of the relay-armature once for each oscillation or impulse of a group representing a dot or dash and a receiver controlled by the relay for rendering manifest the dots and dashes so received.

10. In wireless telegraphy in which a signal wave or impulse representing a dot or a dash is composed of two or more oscillations orimpulses, the combination of the primary-receiver device affected by such signal-wave, a relay in the local circuit of and controlled by said device, local means for automatically causing the vibration of the relay-armature once for each oscillation or impulse of a group representing a dot or a dash, a local circuit controlled by the relay having artificially-added capacity and a receiver which, because of said added capacity, makes manifest as a continuous signal each group of received impulses.

11. In wireless telegraphy in which a signal wave or impulse representing a dot or a dash is composed of two or more oscillations or impulses, the combination of the primary-receiver device ati'ccted by such signal-wave, a relay in the local circuit of and controlled by said device, local means for automatically causing the vibration of the relay-armature once for each oscillation or impulse of a group representing a dot or a dash, and a local circuit having artificially-added capacity and including a chemical recorder.

In testimony whereof I have hereunto subscribed my name.

PAIRICK B. DELANY.

\Vitnesses:

\VILLIAu A. S'IAHLIN, LILLIE F. BROWNING.

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