Servicing projection equipment (1932)

Page scan 00071 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
00071
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:
August 15, 2024
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LENSES 55 will contract the mount more rapidly than the glass. Handling the hot glass may expose it to a sudden cooling and an uneven stress. Avoid all such conditions. (f) — This trouble may also be due to poor, cheap glass in cheap lenses which are unable to stand any strain. 2. Condensers Become Discolored (a) — This is due to the chemicalization of the ingredients in certain types of glass. If the make in use discolors considerably, change to another brand. By looking through the edge of the lens, when selecting it, any discoloration can be detected. Reject any discolored lenses, especially if of a greenish hue, since this tint is apt to interfere with color film projection and will, in general, give an unpleasant tone to the screen light. 3. Condensers Pit Badly (a) — Some makes of coated carbons have a greater tendency to pit condensers than others. If the crater distance cannot be altered or the use of metallic coated carbons discontinued, try another brand or make of coated negatives. 4. Lenses Seem Streaky (a) — This is, probably, due to oil or dirt. Clean the surfaces with a half-and-half solution of water