US1955011A

US1955011A - Electric short wave thermionic valve generator

Info

Publication number: US1955011A
Application number: US651570A
Authority: US
Inventors: Christopher Eric
Original assignee: MO Valve Co Ltd
Current assignee: MO Valve Co Ltd
Priority date: 1932-01-21
Filing date: 1933-01-13
Publication date: 1934-04-17
Anticipated expiration: 1951-04-17
Also published as: FR748582A

Description

.April 17, 1.934.

ELECTRIC SHORT WAVE THERMION I C VALVE GENERATOR Filed- Jan. 13. 1 933 E. c. s. MEGAW 1,955,011

Patented Apr. 17, 1934 UNITED STATES" PATENT- OFFICE ELECTRIC SHORT WAVE THERMIONIC VALVE GENERATOR Eric Christopher Stanley Megaw, Chelsea, London, England, assignor to The M-O Valve I Company Limited, London, England Application January 13,

1933, Serial No. 651,570

In Great Britain January 21,1932 6 Claims. (01. 250-275) This invention relates to valve generators of short electrical waves enclosed in sealed envelopes. By short waves are meant those of wave length less than 3 metres.

5 A generator of short waves is usually connected to a circuit tuned to the frequency of the waves. If this circuit is placed outside the envelope of the generator, it is often difiicult to make the circuit small enough to have the necessary high frequency, because the leads from the interior to the exterior form part of the circuit; further trouble arises from the capacity between the leads where they pass through the envelope.

According'to the invention a valve generatorof short electric waves comprises a tuned circuit enclosed within its envelope, the frequency of which can be varied without opening the envelope. One method of carrying the invention into effect will now be described with reference to the accompanying drawing which shows a generator constructed in accordance with the invention.

The valve generator is of the kind in which the anode consists of two parts and a magnetic field.

is maintained between the anode and the cathode by an electromagnet, the cylindrical pole pieces 10 of which are indicated'onthe drawing, the axes of the pole pieces being substantially in line with the filament.

them. 3, 3' are leads to the two parts of the anode, sealed through thefenvelope 4. Within the envelope the" leads have the form of a substantially parallel pair of straight wires which are divided into two

sections

5, 5' and 6, 6 by the movable bridge piece .of metal 7. This bridge piece does notrest on the wires, but is supported out of contact with them on the glass fork 8,

sealed to the wall of the vessel, which must lie;

0 during operation approximately in a' horizontal plane.- The two prongs of the fork 8 are parallel to the wires and are provided with pairs of corresponding notches 9, in one of which the bridge piece 7 rests; it can be moved from one pair of 4 corresponding notches to another by tilting the vessel, and the length of the be varied. 4 a

The tuned circuit consists of the anode segments '1, 1', the parts 5, 5' of the anode leads 5 attached to them and the bridgepiece '7; the capacity between the bridge piece and the wires provides part of the capacity of the circuit and at the same time couples the tuned circuit to the output circuit consisting ofthe

parts

6, 6 of the section 5, 5' can thus anode leads and any apparatus connected to them A 1, 1' are the two parts of the. anode; 2 the incandescent cathode enclosed by changed.

I claim:---

1. A valve generatorof short electric waves including in combination in a sealedenvelope an electrode adapted to act as anode, an electrode adapted to act as cathode, a tuned circuit, and means within. the envelope forvarying the frequency of said tuned circuit without opening the envelope.

2. A valve generator of short electric waves in-- cluding in combination in a sealed envelope an electrode adapted to'act as anode and divided into a plurality of parts, an electrode adapted to act as cathode surrounded by the said parts of the said divided anode, a timed circuit, and means within the envelope for varying the frequency of said tuned circuit without opening the envelope.

3. A valve generator of short electric waves including" in combination in a sealed envelope an electrode adapted .to act as anode and-divided into a plurality. of parts, an electrode adapted to actas cathode surrounded by the said parts of the said divided anode and a tuned circuit, the frequency of which can be varied without opening the envelope, said circuit comprising two substantially'parallel conducting members each at,-

tached to an electrode in the valve and amovable bridge piece mounted near but not-in contact with the said wires.

4. A valve generator of short electric waves including in combination in a sealed envelope an electrode adapted to act as anode and divided into a plurality of parts, an electrode adapted to act as cathode surrounded by the said parts of the said divided anode-ands. tuned circuit, the frequency of whichcan be varied'without opening the envelope, said circuit comprising two substantially'parallel conducting members each attached to an electrode in the valve and a movable bridgepiece mounted near but not incontact with the said wires supported freely on notched insulating members.

5. Avalve generator of short electric waves including'in combination in a sealed envelope an electrode adapted to act as anode and divided into a plurality of parts, an electrode adapted to act as cathode surrounded by the said parts of the said divided anode and a tuned circuit, the frequency of which can be varied without opening the envelope, said circuit comprising two substanelectrode adapted to act as anode and divided into a plurality of parts, an electrode adapted to act as cathode surrounded by the said parts of the said divided anode and a tuned circuit, the

'frequency of which can be varied without opening the envelope, said circuit comprising two substantially parallel conducting members each attached to an electrode in the valve and a movable bridge piece mounted near but not in contact with the said wires and supported freely on notched insulating members and movable along the length of the said two parallel conducting members, from one pair of notches to another in the said notched insulating members by a suitable movement of the whole generator and means for maintaining a magnetic field between the said parts of the said divided anode and the said cathode. ERIC CHRISTOPHER STALLEY MEGAW.