Cine-film projection : a practical manual for users of all types of 16-mm. (1952)

Record Details:

Title:
Cine-film projection : a practical manual for users of all types of 16-mm.
Date:
1952
Publisher:
London : The Fountain Press
Volume:
Cine-film projection : a practical manual for users of all types of 16-mm.
Leaf #:
00043
Language:
English
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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DUSTPR.OO* CHAMBER tXClTEH lAMP THE SCANNING SYSTEM A cut-away view of the Photo Electric Cell within the sounddrum. The illustration is based upon the "average" 16 mm. projector. Both the exciter lamp and the sound optical system are usually adjustable, but any adjusting or servicing of these parts must always be carried out with extreme care and gentleness. This tiny slit must be kept completely free from dust, and it is usually sealed up in a dust-proof cylinder which also contains the condensing and projector lenses of the sound-optical system. In some projectors the light is reflected onto the photo-cell by means of a prism, and this, together with all exposed parts of the system, must be kept absolutely free from dust, a single speck of which may ruin the sound. The Photo-electric Cell We have already mentioned that the photo-electric cell re-acts electrically according to the amount of light directed upon it, and also, that variations of the light are produced by variations in the shading of the sound-track. Rather like a small valve in appearance, the photo-electric cell also contains a cathode and anode. The cathode, however, consists of a plate on which is coated a light-sensitive substance. 39