GB425251A - Improvements in or relating to devices for supervising the speed of gramophone turntables - Google Patents
Improvements in or relating to devices for supervising the speed of gramophone turntablesInfo
- Publication number
- GB425251A GB425251A GB34354/33A GB3435433A GB425251A GB 425251 A GB425251 A GB 425251A GB 34354/33 A GB34354/33 A GB 34354/33A GB 3435433 A GB3435433 A GB 3435433A GB 425251 A GB425251 A GB 425251A
- Authority
- GB
- United Kingdom
- Prior art keywords
- turntable
- speed
- border
- advertising
- apertures
- 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
- 238000007689 inspection Methods 0.000 abstract 1
- 229910052754 neon Inorganic materials 0.000 abstract 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
- G01P3/40—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light using stroboscopic means
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
Abstract
425,251. Advertising on gramophones. COMPARE, M., 3, Via Fratelli Bronzetti, and COMPARE, R., 12, Via Leone Tolstoi, both in Milan, Italy. Dec. 6, 1933, No. 34354. Convention date, Dec. 6, 1932. [Class 3 (i)] [See also Groups XXXVIII and XIX] A stroboscopic device for supervising the speed of a gramophone turntable may be used for advertising. According to the invention, an annular border or crown b which may be cylindrical as shown, or conical, is formed on or attached to the edge of the turntable, a series of uniformly-spaced apertures or serrations being formed in the border. The apertures are illuminated by an intermittent source of light, such as a neon lamp c placed behind or externally to the border b. The spacing of the apertures is so chosen in accordance with the frequency of the current supplied to the lamp that the stroboscopic effect produced in known manner is utilized to indicate when the turntable is running at the required speed. When the device is used for advertising purposes, a plate, which may be transparent, and which bears a design or lettering, is arranged behind the apertures. The letters &c. on the plate are clearly visible when the speed of the turntable is correct. The Specification as open to inspection under Sect. 91, described the invention as applicable for supervising the speed of any " revolving elements," and states that a steady light source " eclipsed at regular intervals by an appropriate moving diaphragm " may be used. For advertising, slits in the border of the turntable may be shaped as letters &c. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT425251X | 1932-12-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB425251A true GB425251A (en) | 1935-03-11 |
Family
ID=11254313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34354/33A Expired GB425251A (en) | 1932-12-06 | 1933-12-06 | Improvements in or relating to devices for supervising the speed of gramophone turntables |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB425251A (en) |
-
1933
- 1933-12-06 GB GB34354/33A patent/GB425251A/en not_active Expired
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