Cinematographic annual : 1930 (1930)

Page scan 000617 from Cinematographic annual : 1930

Record Details:

Title:
Cinematographic annual : 1930
Date:
1930
Publisher:
Hollywood : The American Society of Cinematographers, Inc.
Volume:
Cinematographic annual : 1930
Leaf #:
000617
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Richard Koszarski","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
July 04, 2024
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MISCELLANEOUS TABLES Intrinsic Brightness of Light Sources 597 Light Source Candle Power per Sq. M/M High Intensity White Flame Carbon Arc, Forced 1200 Pure Carbon Arc at 22 atmospheres (about) Sun at Zenith 1000 920 690 500 180 130 8.0 High Intensity White Flame Carbon Arc, as usually operated Positive Crater of Tantalum Arc (about) . PositiveCrater of Solid Carbon Arc, on D.C. Positive Crater of Cored Carbon Arc, on D.C. Yellow Arc Stream Magnetite Arc Stream Mercury Vapor Tube 6.2 0.023 Moore Carbon Dioxide Tube 0.009 Electrical Energy The power that is transmitted by any electric circuit depends on the current and the voltage. The unit, the watt, is the amount of power obtained from one ampere at one volt. This unit is too small for ordinary purposes and the kilowatt equal to 1 000 watts is used. For D. C. circuits: W = IxE W = Power in watts I = Current in amperes E = Electromotive force in volts In A. C. circuits the entire current is not always available for doing work. This calls for another term in the energy equation, the power factor, which is the ratio of the current available for power to the total current. For single-phase A. C. circuits the equation becomes W = IxExP P = Power factor of the circuit For two-phase A.C. W = 2xIxExP For three-phase A.C. W = i.73xIxExP Electrical and Mechanicai Conversion Factors 1 H.P. = 746 watts = .746 kw. 1 kw* = 1.344 H.P. = approx. iJA H.P.