GB332469A - Improvements in and relating to electrical instruments - Google Patents
Improvements in and relating to electrical instrumentsInfo
- Publication number
- GB332469A GB332469A GB2975729A GB2975729A GB332469A GB 332469 A GB332469 A GB 332469A GB 2975729 A GB2975729 A GB 2975729A GB 2975729 A GB2975729 A GB 2975729A GB 332469 A GB332469 A GB 332469A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- reeds
- gap
- high resistance
- extremities
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R13/00—Arrangements for displaying electric variables or waveforms
- G01R13/04—Arrangements for displaying electric variables or waveforms for producing permanent records
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnets (AREA)
Abstract
332,469. Cambridge Instrument Co., Ltd., Mason, C. C., and Moss, E. B. Oct. 1, 1929. Oscillographs.-A moving- iron oscillograph comprises two magnetic reed members forming an air-gap at their free extremities, a strong unidirectional field surrounding the extremities, and means for magnifying the relative movement of the free ends of the reeds on energization of the magnetic circuit by the current to be measured. As shown, Figs. 1, 2, the reeds 1, 2 are formed as extensions to a laminated core 5 of low hysteresis loss and high resistance, a powerful field across the gap 6 being produced by magnet poles 7, 8. A mirror 11 is floated on knife-edges 9, 10 mounted on the reeds. A high resistance is necessary in circuit with the energized coil 4, and preferably a thermionic valve having five or fewer electrodes is employed, the coil 4 being directly connected in the anode circuit. The oscillograph may be transformer coupled or connected through impedances to the valve circuit. More than one stage of amplification may be provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2975729A GB332469A (en) | 1929-10-01 | 1929-10-01 | Improvements in and relating to electrical instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2975729A GB332469A (en) | 1929-10-01 | 1929-10-01 | Improvements in and relating to electrical instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB332469A true GB332469A (en) | 1930-07-24 |
Family
ID=10296680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2975729A Expired GB332469A (en) | 1929-10-01 | 1929-10-01 | Improvements in and relating to electrical instruments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB332469A (en) |
-
1929
- 1929-10-01 GB GB2975729A patent/GB332469A/en not_active Expired
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