GB355891A - Electrically controlled stopping mechanism for talking machines or gramophones - Google Patents
Electrically controlled stopping mechanism for talking machines or gramophonesInfo
- Publication number
- GB355891A GB355891A GB2074830A GB2074830A GB355891A GB 355891 A GB355891 A GB 355891A GB 2074830 A GB2074830 A GB 2074830A GB 2074830 A GB2074830 A GB 2074830A GB 355891 A GB355891 A GB 355891A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pick
- gramophones
- relay
- grid
- record
- 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
- G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
- G11B17/02—Details
Landscapes
- Toys (AREA)
Abstract
355,891. Gramophones. MAINS RADIO GRAMOPHONES, Ltd. and ROBERTS, E. H., 8, Vaughan Street, Bradford, Yorkshire. July 9, 1930, No. 20748. [Class 40 (ii).] Stopping.-Gramophones with electric pick-ups are stopped at the end of a record by the action of a thermionic relay influenced from the amplifying circuit of the pick-up, this relay operating, when the grid of the valve is not excited by the pick-up, as at the end of the playing grooves of a record, to arrest an electric driving motor or to apply a brake. The pick-up is connected through a transformer a to the grid c<2> of a valve c which is negatively biased as that the anode current is small. A relay g in the anode' circuit closes a switch h<2> in a line h so long as the pick-up imposes oscillations on the grid and maintains a current through the valve. At the end of a record, oscillations are no longer imposed on the grid and the relay then allows the switch h<2> to open, whereupon the motor circuit is broken or a brake applied. The relay conveniently embodies a tilting mercury switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2074830A GB355891A (en) | 1930-07-09 | 1930-07-09 | Electrically controlled stopping mechanism for talking machines or gramophones |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2074830A GB355891A (en) | 1930-07-09 | 1930-07-09 | Electrically controlled stopping mechanism for talking machines or gramophones |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB355891A true GB355891A (en) | 1931-09-03 |
Family
ID=10150996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2074830A Expired GB355891A (en) | 1930-07-09 | 1930-07-09 | Electrically controlled stopping mechanism for talking machines or gramophones |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB355891A (en) |
-
1930
- 1930-07-09 GB GB2074830A patent/GB355891A/en not_active Expired
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