GB322729A - Improved method of photographically recording acoustic frequency oscillations - Google Patents
Improved method of photographically recording acoustic frequency oscillationsInfo
- Publication number
- GB322729A GB322729A GB2222428A GB2222428A GB322729A GB 322729 A GB322729 A GB 322729A GB 2222428 A GB2222428 A GB 2222428A GB 2222428 A GB2222428 A GB 2222428A GB 322729 A GB322729 A GB 322729A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mercury
- tube
- discharge
- electrodes
- vapour
- 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
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
Landscapes
- Lasers (AREA)
Abstract
322,729. Gramophone Co., Ltd., Browne, C. O., and Tedham, W. F. July, 31, 1928. Metallic-vapour apparatus.-Acoustic frequency oscillations are recorded photographically by impressing the oscillations upon an electric glowdischarge device so as to control the light emitted from the positive column of said discharge device, the latter having a filling of mercury vapour at a pressure between 0.5 cm. and 1 cm. of mercury and substantially no other gas or vapour. One form of discharge tube 1, Fig. 1, suitable for direct insertion into the anode circuit of a valve amplifier is made of quartz or is provided with a quartz window and has mercury electrodes 2 and heating coils 3; platinum electrodes may be used. In a modification, Fig. 3, aT-shaped quartz tube has mercury electrodes 2 between which an ionizing discharge is produced by a direct-current source 8, a stabilizing resistance 13 being inserted as shown. The acoustic current source, such as the secondary winding of the output transformer 9 of an amplifier, is connected to a solid electrode 7, and to one of the terminals of the source 8 to a, point on a resistance shunting the source 8, or to a second solid electrode inserted in the horizontal part of the tube 1. A polarizing discharge is established between the electrode 7 and one or both of the mercury electrodes by means of a direct-current source 11 having a resistance 12 in circuit. Only the light from the acoustic current glow in the vertical portion of the tube is used, means being provided to prevent the light coming from the ionizing discharge between the mercury electrodes from affecting the photographic film. The heating coils 3 keep the tube at its correct temperature which is stated to be about 175‹ C.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2222428A GB322729A (en) | 1928-07-31 | 1928-07-31 | Improved method of photographically recording acoustic frequency oscillations |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2222428A GB322729A (en) | 1928-07-31 | 1928-07-31 | Improved method of photographically recording acoustic frequency oscillations |
Publications (1)
Publication Number | Publication Date |
---|---|
GB322729A true GB322729A (en) | 1929-12-02 |
Family
ID=10175926
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2222428A Expired GB322729A (en) | 1928-07-31 | 1928-07-31 | Improved method of photographically recording acoustic frequency oscillations |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB322729A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107643228A (en) * | 2017-08-31 | 2018-01-30 | 中国船舶重工集团公司第七〇九研究所 | Measure chip of mercury vapour and preparation method thereof, sensor and its application method |
-
1928
- 1928-07-31 GB GB2222428A patent/GB322729A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107643228A (en) * | 2017-08-31 | 2018-01-30 | 中国船舶重工集团公司第七〇九研究所 | Measure chip of mercury vapour and preparation method thereof, sensor and its application method |
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