US1338889A - Apparatus for radiosignaling - Google Patents

Description

R. A. WEAGANT.

APPARATUS FOR RADIOSIGNALING.

APPLICATION FILED FEB. 1, 1916.

1,388,889. Patented May 4, 1920.

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RADIO CORPORATION OF AMERICA, A. CORPORATION OF DELAWARE.

APPABATUQ FOB RADIOSIGNALING.

Specification of Letters Batent.

Patented May 4, 1920.

j Application filed February 1, 1916. s 'r1a1 No. 75,563.

To all whom it may concern:

Be it known that I, ROY A. WEAGANT, a citizen of the United 'States, residing at Roselle, Union county, State of New Jersey, have made certain new and useful Improvements in Apparatus for Radiosignaling, of which the following is a Specification.

This invention relates to vacuum detectors or valves of the class in which a heated element and an element of. lower temperature, or a cold element, are located within the valve chamber, combined with an indicator having its terminals connected to the two elements respectively; and the object is to increase the effectiveness of the valve for the purpose-intended. The improvement is founded upon the well-known vacuum valve shown and described.- in United States Letters Patent of J. A. Fleming, No. 803,684, dated November 7 1905, and the various-modifications thereof now in use.

As is well known, in devices of this kind, operating by virtue of an electronic flow between a hot and cold electrode in 'a vacuum, current will flow upon receipt of a signal from the hot element or electrode to the cold, since the heated element gives ofl negative electrons. In the case of devices of this kind now in use, the cold element is made positive when a signal is received, with respect to one of the'leading in wires of the filament, and it is therefore made positive with respect to a relatively cold portion of the filament.

When no signal is being received, the filament, if heated, is giving ofi electrons, and the cold element tends to assume the potential of some particular point upon the filament, depending upon the relative location of the hot and cold elements and upon their form.

The object of my invention is to provide means whereby the cold element may be connected with the indicator and a point upon the filament, the potential of which the cold element tends to assume, and thus,

Fig. 2 shows a modification in which a battery is used in the local circuit.

The vacuum chamber (1. includes a hot element 1) and a cold element 0, with electrical connections (I extending to points outside the chamber; element 0 may be a cylinder of metal or may take any other suitable form. The filament b, which may be of metal, like tungsten, or of carbon, is connected by leads 7 and e to a battery h or source of current, including a regulating resistance 11, with means for adjusting the electro-motive force. The local circuit j, includes the secondary coil of an inductorium, k, the primary m of which is in an aerial wire n, grounded at 0. One terminal of. the indicator 1, which may be a telephone, galvanometer or other suitable instrument, is connected in circuit through coil is to the element 0 through the lead d; the other terminal of indicator Z is connected directly to a predetermined point :0 in the heated element 6. The point a: is preferably one of the hottest in the filament, or a point,

the potential of which the cold element tends to assume whenno signals are being received. It will be understood that any other suitable means for causing the indicator to respond to current variations in the circuit connecting the hot and cold elements may be used. In Fig. 2 there is shown a battery 12 in series with the coil is. The connection of the terminal of the indicator 1, which may be of any known and suitable character, directly to a hot point in the filament, results in indications of greatly increased volume and strength.

. My invention is not limited to' the specific form of devices illustrated, nor to any particular construction of valve or arrangement of circuits, since many modifications, which do not depart from the spirit of my invention, will be obvious tothose skilled in the art.

What I claim is:

1. In a valve of the described character, the combination of a chamber'or inclosure, a plurality of fixed circuit terminals, one of which is heated, located within said chamber; a circuit, an indicator in said circuit, a direct, electrical connection from a point in said circuit on one side of said indicator toa heated point in said heated elenection from a point in said ci cuit, on the other side of said indicator, to nothei of said elements. I

2. In a valve of the described character the combination of a chamber or inclosure, a plurality of fixed circuit terminals in said chamber, one of which terminals isiheated, acircuit, an indicator insaid circuit, and direct, electrical connections from the terminals of id indicator to a hot point-or section of said heated terminal within said chamber and to another of said terminals, respectively. 1

3. In apparatus of the described character, the combination of an airtight chamber or inclosure, ahot element and a cold element in said chamber, an indicating device and two electrical connections, one extending from said indicating device to one of said elements and the other extending directly to a hot point in said heated element within said chamber. i

4. In a vacuum valve the combination of an'airtight chamber, ahot element in said chamber and a fixed, material element in cooperative relation with said hot element and an indicator having one terminal connected directly to a hot point in said hot element within said chamber and the'other terminal connected to said second element.

5. In a vacuum valve the combination of an airtight chamber, a'hot element in said chamber, a fixed, material element in cooperative relation with said hot element, and an indicator having one terminal connected directly to a point of maximum temperature in the hot element within said chamber and the other terminal connected to the second named element.-

6. In a vacuum valve the combination of an airtight chamber, a hot element, in the form of a wire or filament, in said chamber, a second element cooperating with said hot element and an indicator having one terminal connected to the second element and the other terminal connected directly to the hottest point in said filament or Wire within said chamber. I

7. In a vacuum valve for use in radio signaling the combination of a sealed chamber, a hot element, a comparatively cold element in said chamber and a circuit including an indicating device, having one terminal connected to said cold element and the other terminal connected directly to a heated point on said hot element within said chamber.

8. In a vacuum valve for use in radio signaling, a sealed chamber, a heated ele-' ment and a second element in said chamber, in combination with a circuit, an indicator in said circuit and electrical connections between oints in said circuit on opposite sides 0% said indicator and directly to a heated point in one element within said -point intermediate the terminals of said hot element with said second element, and an indicating device associated with said circuit.

- 11. The combination with a vacuum valve.

including a chamber containing a heated element, of an indicator having one terminal connected to a point intermediate the terminalsof the heated element and the other terminal connected to an element cooperating with said heated element.

12. The combination with a vacuum valve, includin a chamber containing a heated element, 0 anindicator having one terminal connected directly to a point of high temperature in one element within said chamber and its other terminal connected to the element cooperating with the first named element.

13. The combination with a vacuum valve including a chamber containing a heated element and a cooperating cooler element of a circuit .havin one terminal connected directly to a point of high temperature in said heated element within said chamber, and its other terminal connected to the element cooperating with the first-named element.

14. In a device of the kind described, the combination ofa sealed chamber, a hot element and a relatively cold element therein, and a connection extending from the cold element directly to a point upon the hot element within said chamber, the potential of which the cold element tends to assume.

15. In a device of the kind described, the combination of a vacuous vessel, a hot element and a relatively cold element sealed therein, an indicating instrument and con- ROY A WEAGANT.

Witnesses:

M. M. RIEMANN, JOHN HERB, Jr.

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