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
Application number
GB2756837A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metrawatt AG
Original Assignee
Metrawatt AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Metrawatt AGfiledCriticalMetrawatt AG
Priority to GB2756837ApriorityCriticalpatent/GB481656A/en
Publication of GB481656ApublicationCriticalpatent/GB481656A/en
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)
Photometry And Measurement Of Optical Pulse Characteristics
(AREA)
Abstract
481,656. Photo - electric exposure meters. DIXON, H. E. (Metrawatt Akt.- Ges. Fabrik Elektrischer Messgeraete) Oct. 11, 1937, No. 27568. [Class 40 (iii)] Relates to exposure meters comprising a photo-electric cell band a direct current meter a, and consists in providing the casing with a front opening c and a side opening d to be used aternatively for two different ranges of measurement. The front opening c may be closed by a pivoted shutter f, the back of which may reflect or diffuse light from the side opening on to the cell. The edge g of the side opening may also be made to reflect or diffuse light on to the cell; and this opening may be closed by an elastic cap.
GB2756837A1937-10-111937-10-11Improvements in photo-electric exposure meters
ExpiredGB481656A
(en)
Furniture with shutter closure to contain measuring instruments radiorreceptores and appliances in general (Machine-translation by Google Translate, not legally binding)
Improvements in devices for determining stop or diaphragm opening and/or the focus, minimum distance and maximum distance of range in photographic cameras