Nation projector carbons (1935)

Record Details:

Title:
Nation projector carbons
Date:
1935
Publisher:
Toronto : Canadian National Carbon Company Ltd.
Volume:
Nation projector carbons
Leaf #:
000115
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
May 30, 2024
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Useful Tables PHOTOMETRIC UMTS Luminous Intensity (Candlepower) Unit: Candle The standard candle is maintained by the national laboratories of France, Great Britain and the United States. Luminous Flux Unit: Lumen One lumen is the flux emitted within a solid angle of one steradian from a point source of unit candle power. A source of unit spherical candle power emits 12.57 lumens. Illumination Units: Lux = 1 lumen incident per square meter = 0.0001 phot = 0.0929 foot-candle = 1 lumen incident per sq. cm. = 10,000 lux = 929 foot-candles = 1 lumen incident per sq. ft. = 10.76 lux = 0.001076 phot Phot Foot-candles Brightness Units: Candle per sq. cm. =3.1416 lamberts = 2919 foot-lamberts Candle per sq. in. Lambert Foot-lambert = 0.487 lambert = 452 foot-lamberts = 1 lumen emitted per sq. cm. = 0.3183 candle per sq. cm. = 2.054 candles per sq. in. = 929 foot-lamberts = 1 lumen emitted per sq. ft. = 0.001076 lambert = 0.000343 candle per sq. cm. = 0.00221 candle per sq. in. Ill