Practical cinematography and its applications (1913)

Record Details:

Title:
Practical cinematography and its applications
Date:
1913
Publisher:
Philadelphia, Lippincott
Volume:
Practical cinematography and its applications
Leaf #:
000128
Language:
English
Collection:
Books
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
14
Date Added:
July 19, 2022
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PRINTING THE POSITIVE 89 The gearing is so designed that six exposures are made per revolution, representing twelve pictures per second, when revolved at the normal speed. With a negative of average density this speed is sufficient. But the period of exposure can be varied according to the speed at which the handle is turned. The turns of the handle should be steady and regular, or the pictures will be of uneven density owing to the variations in exposure. The electric light is easily moved by means of the handle while the ten stops give it great flexibility. In order to maintain an exposure of twelve pictures per second with an average negative, a lamp of 50 candle power should be used. To ensure the best results it should be of the class known as " focus lamp." This type of lamp has a special filament, with a smaller coil than is found in the ordinary incandescent electric lamp. A gas burner with incandescent mantle may be used if electricity is not available, though the operator will have to ascertain the relative value of the luminous intensity of the light as compared with the 50 candle power electric light, and will be wise if he makes one or two trial exposures with short lengths of film before essaying the printing of a complete film. While it is possible during printing to vary