GB590741A - Improvements relating to apparatus for time measurement - Google Patents
Improvements relating to apparatus for time measurementInfo
- Publication number
- GB590741A GB590741A GB480545A GB480545A GB590741A GB 590741 A GB590741 A GB 590741A GB 480545 A GB480545 A GB 480545A GB 480545 A GB480545 A GB 480545A GB 590741 A GB590741 A GB 590741A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pendulum
- photo
- light
- electric cell
- electric
- 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
- G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
- G04C3/02—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a pendulum
- G04C3/027—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a pendulum using electromagnetic coupling between electric power source and pendulum
- G04C3/0278—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a pendulum using electromagnetic coupling between electric power source and pendulum the pendulum controlling the gear-train by means of static switches, e.g. transistor circuits
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Unknown Time Intervals (AREA)
Abstract
590,741. Electric clocks..STOTT, H. T. Feb. 26, 1945, No. 4805. [Class 139] [Also in Group XL] A mechanism for counting the vibrations of a pendulum, balance wheel or other mechanical vibrator has a member carried by the vibrating member arranged to cause, during each vibration, light pulses of short duration to be directed to a photo-electric cell or other light-sensitive element. As shown in Fig. 1, a pendulum P carries at its bottom end a shutter d having a slit e through which a ray of light from a lamp f passes to photo-electric cell PC as the pendulum swings through its mid position. The photo-electric cell is in the circuit shown in Fig. 4 and the change in its resistance when a beam of light strikes it causes an impulse to go through said circuit to actuate relay L1, and close contact m from whence impulse is led to a clock dial, or a counter and also to means for maintaining the pendulum. Photo-electric cells PC 1 and PC 2, Fig. 1, are provided and are positioned to be illuminated if the pendulum overswings and to prevent temporarily the pendulum maintaining means from acting. Instead of a shutter the pendulum could carry a mirror which reflects a beam of light from a light source placed near the pendulum on to a photo-electric cell in the mid-position of the pendulum.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB590741A true GB590741A (en) | 1947-07-28 |
Family
ID=1628117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB480545A Expired GB590741A (en) | 1945-02-26 | Improvements relating to apparatus for time measurement |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB590741A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1239247B (en) * | 1962-11-30 | 1967-04-20 | Telefonbau | Contactor for electrical slave clocks |
-
1945
- 1945-02-26 GB GB480545A patent/GB590741A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1239247B (en) * | 1962-11-30 | 1967-04-20 | Telefonbau | Contactor for electrical slave clocks |
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