GB454573A - Improvements in and relating to apparatus for measuring the intensity of light - Google Patents

Improvements in and relating to apparatus for measuring the intensity of light

Info

Publication number
GB454573A
GB454573A GB1024735A GB1024735A GB454573A GB 454573 A GB454573 A GB 454573A GB 1024735 A GB1024735 A GB 1024735A GB 1024735 A GB1024735 A GB 1024735A GB 454573 A GB454573 A GB 454573A
Authority
GB
United Kingdom
Prior art keywords
lamp
intensity
road
measuring
screen
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
Application number
GB1024735A
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.)
BERNARD REES DAVIES
British Thomson Houston Co Ltd
Original Assignee
BERNARD REES DAVIES
British Thomson Houston Co Ltd
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 BERNARD REES DAVIES, British Thomson Houston Co Ltd filed Critical BERNARD REES DAVIES
Priority to GB1024735A priority Critical patent/GB454573A/en
Publication of GB454573A publication Critical patent/GB454573A/en
Expired legal-status Critical Current

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
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

454,573. Photometers. BRITISH THOMSON, HOUSTON CO., Ltd., Crown House, Aldwych, London, and DAVIES, B. R., 32, Craven Road, Rugby. April 2, 1935, No. 10247. [Class 97 (i)] A photometer, particularly intended for measuring the intensity of illumination of a road surface, comprises a translucent screen 11 through which the road &c. is observed. A small opaque reflecting area 10 of the screen receives light from a lamp 7 and diffusing screen 6 so that the reflected light from the lamp enters the observer's eye. The lamp 7 is carried by a tube 8 which is slidably mounted within a tube 9 so that the position of the lamp can be adjusted until the intensity of the reflected light is equal to that of the observed field. The adjustment of the lamp is indicated on a scale. Where accurate readings are required, a rheostat 15 and a milliammeter &c. 13 may be provided. Specification 15660/12, [Class 97 (i)], is referred to.
GB1024735A 1935-04-02 1935-04-02 Improvements in and relating to apparatus for measuring the intensity of light Expired GB454573A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1024735A GB454573A (en) 1935-04-02 1935-04-02 Improvements in and relating to apparatus for measuring the intensity of light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1024735A GB454573A (en) 1935-04-02 1935-04-02 Improvements in and relating to apparatus for measuring the intensity of light

Publications (1)

Publication Number Publication Date
GB454573A true GB454573A (en) 1936-10-02

Family

ID=9964341

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1024735A Expired GB454573A (en) 1935-04-02 1935-04-02 Improvements in and relating to apparatus for measuring the intensity of light

Country Status (1)

Country Link
GB (1) GB454573A (en)

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