US687440A - Wireless telegraphy. - Google Patents

Description

Patented Nov. 26, I90l.

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NITED STATES Fries.

PATENT ONE-HALF TO GUSTAVE P. GEI-IRING, OF PHILADELPHIA,

VANIA.

PENNSYL- WIRELESS TELEGRAPHY.

SPECIFICATION forming part of Letters Patent No. 687,440, dated November 26, 1901.

Application filed June 10 1901- To aZZ whom it may concern-.-

Be it known that I, HARRY SHOEMAKER, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Wireless Telegraphy, of which the following is a specification.

This invention relates to improvements in wireless telegraphy; and the main object of my invention is the provision of a system having means embodied therein causing a greater difference of potential between the plugs of the coherer to cause greater coherence than would otherwise be possible to obtain.

Another object of my invention is the novel arrangement of said means in a receiving apparatus to give the desired result.

VVit-h these objects in View the invention consists of a system of wireless telegraphy embodying novel feat'u res of construction and combination of parts, substantially as disclosed herein.

In the drawings, Figure 1 is a diagram matical view of an entire system of wireless telegraphy embodying my invention. Fig. 2 is an end view of the intensifying-coil, and Fig. 3 is a side elevation thereof.

Referring to the drawin gs, Adesignates the transmitting-station, and B the receiving-station, of my improved system. The receivingstation consists of the air and ground plates A and G, being connected togetherby the wire 0, which is provided with the coil D intermediate of its length. This coil of the Wire is adapted to lie in the air-gap E of the permanent magnet G, and beside this coil D is a coil II of the wires J, which are connected to the coherer K, having also the condenser L connected therewith. My idea in employing the condenser is to prevent the relay from becoming short-circuited through the coil, as is readily seen,should the condenser be removed therefrom. Connected to these wires is also the main relay-circuit M, having its batteries N and relay 0, said relay operating the receiving instrument circuit P, having the sounder Q. My idea in this construction and arrangement ofparts in the receiving-station is to take the wave that oscillates from the air- Serial No. 63,887. (No model.)

plate to the ground and carry it through a coil or magnet having an intense magnetic field. Now the presence of another coil which practically has a short circuit for the high-frequency waves stops the choking effect in the first coil of the wires and generates a new wave of a frequency depending upon the size of the wire capacity and self-inductance of the magnet. 3y this arrangement I can take a wave having the best frequency in length for transmission through space and convert it into a wave with a shorter length but higher frequency and will thus have more effect upon the coherer, causing greater coherence than would otherwise be possible to obtain. I find this form has greater effect when I have a perm anentfield than when a field is caused by the oscillations of the waves themselves, as in a common inductioncoil. By this constructionthat is, by employing the magnet and placing the same as described--I produce a transformer-that is, the effect of the mag- .net is to give a greater difference of potential between the plugs of the coherer than could be obtained by inserting the coherer directly in the circuit. I also by the use of this device can employ a greater capacitythat is, larger plateshence gathering more energy having a very low potential and greater quantity of current to be transformed into a higher potential.

It will thus be seen that I provide a system having in its receiving-station a permanent magnetic field which is so constructed and arranged as to be an intensifying-coil.

I claii 1. In a receiver for electrical oscillations, the combination of an imperfect electrical contact, an insulated ground and air connection, and means consisting of a permanent magnet intermediate of said connections and the contact for giving a greater difference of potential in the contact.

2. In a receiver for electrical oscillations, the combination of ground and air connections, a coherer, a separate connection connected to the coherer, and a permanent magnot having an air-gap through which the air and ground connections and the coherer connection pass.

3. In a system of wireless telegraphy, the

combination of a transmitting-station, and a receiving-station; said receiving-station comprising, airand ground plates, a wire provided with a coil intermediate of its length connecting said plates, a coherer, another wire provided with a coil connected to the coherer, and a permanent magnet provided with an air-gap through which said coils pass. 4. In a receiver for electrical oscillations, the combination of air and ground plates, a wire provided with a coil connecting said plates, an imperfect electrical contact, another wire provided with a coil connected to said contact, and a permanent magnet provided with an air-gap through which said coils pass.

5. In a receiver for electrical oscillations, the combination of air and ground plates, a wire connecting said plates, a magnet surrounding said Wire, another wire surrounded by the magnet, a coherer and condenser conplates, an imperfect electrical contact, another wire provided with a similar coil connected to said contact, said coils being adapted to be placed closely together in the same plane, and apermanent magnet provided with an air-gap, which is adapted to surround said coils.

In testimony whereof I aflix my signature in presence of two witnesses.

HARRY SHOEMAKER.

YVitnesses:

r WM. J. Moss, E. LEAMAN.

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