GB496968A - Improvements in and relating to photographic exposure meters - Google Patents
Improvements in and relating to photographic exposure metersInfo
- Publication number
- GB496968A GB496968A GB1632937A GB1632937A GB496968A GB 496968 A GB496968 A GB 496968A GB 1632937 A GB1632937 A GB 1632937A GB 1632937 A GB1632937 A GB 1632937A GB 496968 A GB496968 A GB 496968A
- Authority
- GB
- United Kingdom
- Prior art keywords
- instrument
- scales
- parent specification
- photographic exposure
- carrying
- 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
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4209—Photoelectric exposure meters for determining the exposure time in recording or reproducing
- G01J1/4214—Photoelectric exposure meters for determining the exposure time in recording or reproducing specially adapted for view-taking apparatus
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Details Of Measuring And Other Instruments (AREA)
Abstract
496,968. Photo -electric exposure meters. GENERAL ELECTRIC CO., Ltd., TURNER, H. C., and BANNER, E. H. W. June 11, 1937, No. 16329. Addition to 458,695, [Group XX]. [Class 40 (iii)] In a photographic exposure meter of the kind claimed in the parent Specification, comprising an indicating instrument 2 having a linear characteristic, the movable member carrying two of the scales (i.e. the disc shown in the parent Specification as carrying the aperture and platespeed scales) is arranged to actuate a variable resistance 15 which shunts the instrument and which is graded so that for regular movements of the said member the pointer 5 of the instrument moves irregularly, its movement being proportional to a special characteristic such as the logarithm of the output current of the photoelectric cell 1. This arrangement is stated to give greater accuracy than with the prior device in which the magnet poles and/or core are specially shaped to make the instrument logarithmic.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1632937A GB496968A (en) | 1937-06-11 | 1937-06-11 | Improvements in and relating to photographic exposure meters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1632937A GB496968A (en) | 1937-06-11 | 1937-06-11 | Improvements in and relating to photographic exposure meters |
Publications (1)
Publication Number | Publication Date |
---|---|
GB496968A true GB496968A (en) | 1938-12-09 |
Family
ID=10075322
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1632937A Expired GB496968A (en) | 1937-06-11 | 1937-06-11 | Improvements in and relating to photographic exposure meters |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB496968A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE745508C (en) * | 1941-08-08 | 1944-04-19 | Julius Stille | Device for determining the exposure time for photographic recordings |
DE1177474B (en) * | 1961-02-04 | 1964-09-03 | Elbe Kamera Gmbh | Photographic camera with photoelectric exposure control device |
-
1937
- 1937-06-11 GB GB1632937A patent/GB496968A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE745508C (en) * | 1941-08-08 | 1944-04-19 | Julius Stille | Device for determining the exposure time for photographic recordings |
DE1177474B (en) * | 1961-02-04 | 1964-09-03 | Elbe Kamera Gmbh | Photographic camera with photoelectric exposure control device |
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