GB519510A - Photographic system and apparatus for time and other announcements - Google Patents
Photographic system and apparatus for time and other announcementsInfo
- Publication number
- GB519510A GB519510A GB3420038A GB3420038A GB519510A GB 519510 A GB519510 A GB 519510A GB 3420038 A GB3420038 A GB 3420038A GB 3420038 A GB3420038 A GB 3420038A GB 519510 A GB519510 A GB 519510A
- Authority
- GB
- United Kingdom
- Prior art keywords
- record
- cylinder
- photo
- clock
- sound
- 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
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C21/00—Producing acoustic time signals by electrical means
- G04C21/04—Indicating the time of the day
- G04C21/12—Indicating the time of the day by electro-acoustic means
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- General Physics & Mathematics (AREA)
- Electric Clocks (AREA)
Abstract
519,510. Optical sound-reproducing apparatus; clocks. SOLBERG, T. A. Nov. 24, 1938, No. 34200. [Class 40 (ii)] [Also in Group XVIII] A time-controlled announcing system comprises two concentric cylinders separately rotated by gearing with a clock, one of the cylinders carrying a photographic or like announcement record and the other operating mechanism which reciprocates a photo-electric device for scanning the record in timed relationship with the clock, the scanner being adapted to operate sound-reproducing means. In the apparatus shown, an electric clock drives through gearing 3, 13 two cylinders 7, 14 the cylinder 7 being fixed on a spindle 4 and 14 being mounted, concentrically therewith, on bearings 15, 16. The cylinder 14 carries a photographic or like transparent sound record. Between the cylinders extends an arm of a U- shaped frame 9, which is guided on a rail 10 and which carries a photo-electric device for scanning the sound-record. The scanner comprises a lamp 11, an optical system 17, 18, and a photo-electric cell 19. In order to traverse the scanner longitudinally along the record, the inner end of the frame 9 carries a block 8 engaging in a groove 7a in the cylinder 7, Fig. 5, by which, as the cylinder rotates, the block, together with the frame carrying the scanning- device, is moved axially along the cylinders. Thus, the record track on the rapidly rotating cylinder 14 is scanned by the light passing through it from the lamp 11. The groove 7a is continuous, and changes the direction of its pitch at each end of the cylinder, so that the frame 9 is reciprocated. The photo-electric cell 19 is connected in the input of an amplifier which operates a loud-speaker, a suitable circuit being described and shown. Switching mechanism, operated by the clock, is provided to condition the amplifier for operation shortly before each time the passage of light through the sound-track is required to activate the photo-electric cell. For this purpose, a rotary contact arm driven by the clock bridges contacts in the circuit of the transformer which supplies current to the valves, before closing a circuit through the exciter lamp. In a modification, the contacts first closed by the clockdriven switch operate a low-voltage relay by which the transformer supplying the amplifier is energized. Instead of the optical system shown an elongated lamp with a movable shutter may be provided. The apparatus described may be used for announcing time, by speech or by chimes &c. for sounding an alarm, or for' making other announcements or signals, at predetermined times.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3420038A GB519510A (en) | 1938-11-24 | 1938-11-24 | Photographic system and apparatus for time and other announcements |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3420038A GB519510A (en) | 1938-11-24 | 1938-11-24 | Photographic system and apparatus for time and other announcements |
Publications (1)
Publication Number | Publication Date |
---|---|
GB519510A true GB519510A (en) | 1940-03-28 |
Family
ID=10362624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3420038A Expired GB519510A (en) | 1938-11-24 | 1938-11-24 | Photographic system and apparatus for time and other announcements |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB519510A (en) |
-
1938
- 1938-11-24 GB GB3420038A patent/GB519510A/en not_active Expired
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