GB514318A - Improvements in or relating to visual voltage indicators of the electron discharge type - Google Patents
Improvements in or relating to visual voltage indicators of the electron discharge typeInfo
- Publication number
- GB514318A GB514318A GB13062/38A GB1306238A GB514318A GB 514318 A GB514318 A GB 514318A GB 13062/38 A GB13062/38 A GB 13062/38A GB 1306238 A GB1306238 A GB 1306238A GB 514318 A GB514318 A GB 514318A
- Authority
- GB
- United Kingdom
- Prior art keywords
- indicator
- rod
- cathode
- voltage
- fluorescent screen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000000007 visual effect Effects 0.000 title abstract 2
- 230000003321 amplification Effects 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/12—Electrically-operated arrangements for indicating correct tuning
- H03J3/14—Visual indication, e.g. magic eye
Landscapes
- Amplifiers (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
514,318. Wireless receiving apparatus. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. May 2, 1938, No. 13062. Convention date, April 30, 1937. [Class 40 (v)] A visual tuning indicator, of the type described in Specification 481,790, is arranged so that the control electrode can become negatively biassed relatively to the cathode, thereby increasing the area or angle of the shadow thrown by the control rod on the fluorescent screen. As shown in the Figure, the indicator tube 10 is coupled to a valve 18, the anode 21 of which is connected to the anode 13 of the indicator. This is connected, in turn, to the control rod 15 which shadows the fluorescent screen 14. The cathode 11 of the indicator is tapped to a potentiometer 16, 17 so that it is above earth potential. With no signal on the grid 20, the current through the resistance 22 drops the voltage of the anodes 21, 13, and therefore the voltage of the rod 15, below that of the fluorescent screen, so that the shadow thrown by the rod is a maximum. The circuit constants are so chosen that the voltage-drop across the tube 18 is less than that across the resistance 17, so that the rod 15 is negative with respect to the cathode 11. This increases the normal area of the shadow it casts. The indicator tube may contain only the elements 11, 15, 14, the necessary amplification being effected either by the valve 18, or by a separate combined amplifier and detector.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US139842A US2122267A (en) | 1937-04-30 | 1937-04-30 | Tuning indicator circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB514318A true GB514318A (en) | 1939-11-06 |
Family
ID=22488543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13062/38A Expired GB514318A (en) | 1937-04-30 | 1938-05-02 | Improvements in or relating to visual voltage indicators of the electron discharge type |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2122267A (en) |
| GB (1) | GB514318A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2468082A (en) * | 1942-09-12 | 1949-04-26 | Int Standard Electric Corp | Thermistor circuit compensating for supply voltage fluctuations |
| US2455437A (en) * | 1943-11-13 | 1948-12-07 | Distillation Products Inc | Ionization gauge circuits |
| US2478742A (en) * | 1944-07-15 | 1949-08-09 | Westinghouse Electric Corp | Electric current meter |
| US2606231A (en) * | 1945-12-29 | 1952-08-05 | Katzman Jacob | Multiple checking and inspection device and system for the measurement of electrical units |
| US2580416A (en) * | 1946-06-17 | 1952-01-01 | Arthur E Ericson | Electron prod |
-
1937
- 1937-04-30 US US139842A patent/US2122267A/en not_active Expired - Lifetime
-
1938
- 1938-05-02 GB GB13062/38A patent/GB514318A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2122267A (en) | 1938-06-28 |
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