British Kinematography (1953)

Record Details:

Title:
British Kinematography
Date:
1953
Publisher:
London, British Kinematograph Society
Volume:
British Kinematography (1953)
Leaf #:
000208
Language:
English
Subjects:
Motion Pictures, Film Industry Technical Magazine
Collection:
Global Cinema, United Kingdom, and Hollywood Studio System
Format:
Periodicals
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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70 BRITISH KINEMATOGRAPHY Vol. 23, No. 3 Fig. 4 Motiograph sound system, including lamp switching panels, turn table record player and radio. of the base. It is much simpler to use a base which allows easier tilting and provides a steady foundation for the projector. Most American projectors are intended to have excess oil drain to the front of the mechanism. In drive-in projectors the oil drainage is in the opposite direction and this becomes a problem. Suprex lamps using copper-coated carbons and operated at 60 to 80 amperes are favoured for the smaller theatres. Larger theatres require higher intensity lamps burning about 150 amperes. The exhaust outlets from the lamps are usually less than 5 feet from the lamp housing to the roof. Sometimes a strong wind will blow back with consequent flickering of the arc and even cause damage to the reflectors. Since drive-ins are in a semi-rural location the power is frequently drawn from lines having an unsteady voltage. This unsteadiness may be abrupt and irregular, or it may be a steady decline which begins about the time the show starts and reaches its lowest point about 10.00 p.m., when it starts to climb again. By closing time it may be 10 per cent to 15 per cent above normal. In some instances, the line voltage has dropped from a normal of 1 17 volts to 85 volts. The effect on light and sound can be imagined, and it will be appreciated that the projectionist has to be