GB141790A - Improved means for recording sound - Google Patents
Improved means for recording soundInfo
- Publication number
- GB141790A GB141790A GB134919A GB134919A GB141790A GB 141790 A GB141790 A GB 141790A GB 134919 A GB134919 A GB 134919A GB 134919 A GB134919 A GB 134919A GB 141790 A GB141790 A GB 141790A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- battery
- thermionic
- grid
- filament
- 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
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
141,790. Guest, L. G. W., and Merriman, H. O. Jan. 18, 1919. Thermionic relays.-Relates to apparatus for recording sound by telephonic transmission and amplification, and consists in employing an instrument of the kind described in Specification 18765/13 as the receiver and recorder of the telephonic transmission, preferably in combination with thermionic relays in the telephone circuit. As shown in the figure, the battery circuit b includes three telephone transmitters a, a<1>, a<2> in parallel and a transformer primary coil c. The secondary coil c' is connected between the filament p and grid t of a thermionic valve l<1>, the piate circuit of which includes switch contacts o and battery n. This plate circuit is also coupled through a transformer u to the grid-filament circuit of a second valve m<1>, the plate circuit of which includes other switch contacts o and the battery n. By means of the switch o the coil k of the recording instrument f can be connected in either plate circuit. The filaments p are energized by a battery q through a resistance r, and the normal potential of the grids t is determined by connecting them to a point on the potentiometer s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB134919A GB141790A (en) | 1919-01-18 | 1919-01-18 | Improved means for recording sound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB134919A GB141790A (en) | 1919-01-18 | 1919-01-18 | Improved means for recording sound |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB141790A true GB141790A (en) | 1920-04-19 |
Family
ID=9720445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB134919A Expired GB141790A (en) | 1919-01-18 | 1919-01-18 | Improved means for recording sound |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB141790A (en) |
-
1919
- 1919-01-18 GB GB134919A patent/GB141790A/en not_active Expired
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