GB191420798A - Improvements in Optical Phonographs. - Google Patents
Improvements in Optical Phonographs.Info
- Publication number
- GB191420798A GB191420798A GB191420798DA GB191420798A GB 191420798 A GB191420798 A GB 191420798A GB 191420798D A GB191420798D A GB 191420798DA GB 191420798 A GB191420798 A GB 191420798A
- Authority
- GB
- United Kingdom
- Prior art keywords
- optical
- film
- lamp
- circuit
- light
- 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
Abstract
20,798. Stocks, H. B. Oct. 10. Optical; records, optical.-In optical phonographic recording apparatus, a travelling photographic film is acted upon by a beam of light the area and intensity of which are varied by the sound waves. As shown in Fig. 1, a microphone a is in circuit with, or is inductively connected to, a magnet b placed adjacent to a mercury-vapour lamp e, as described in Specification 1364/04. The voice currents thus vary the luminosity of the lamp e, and also its resistance. The circuit of the lamp e includes another magnet f which, by acting on a sliding plate h having a V-shaped upper edge, controls the opening between it and a fixed plate and so varies the width of the beam of light passing through to a film travelling behind the shutter. The film record thus obtained comprises a strip of varying width and varying transparency. To reproduce, the film is passed between a light and a selenium cell in circuit with a telephone receiver. A mercury-vapour lamp may be employed as a relay between the selenium cell and the receiver. The phonograph may be operated in conjunction with a kinematograph machine.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB191420798T | 1914-10-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB191420798A true GB191420798A (en) | 1915-09-16 |
Family
ID=32586276
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB191420798D Expired GB191420798A (en) | 1914-10-10 | 1914-10-10 | Improvements in Optical Phonographs. |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB191420798A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE754328C (en) * | 1929-12-18 | 1952-10-06 | Rca Corp | Sound film with a frequency and volume recording and process for its production |
-
1914
- 1914-10-10 GB GB191420798D patent/GB191420798A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE754328C (en) * | 1929-12-18 | 1952-10-06 | Rca Corp | Sound film with a frequency and volume recording and process for its production |
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