Servicing projection equipment (1932)

Page scan 00061 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
00061
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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LIGHT SOURCE 45 9. Arc Fluctuates, Although Carbons are Right and Contacts Clean and Tight (a) — Examine the generator. A dirty generator commutator or dirty brushes may bring about this condition. For the correction of such trouble look under section headed Motors and Motor Generators. 10. Arc Unstable, Even Goes Out, With Reflector Arc Lamps (a) — This may be due to poor ventilation, for this type is most sensitive to strong drafts or sudden currents of air. Avoid trouble by seeing that no ventilating fan, etc., forces cold air or a strong draft upon the arc. 11. Arc Amperage Excessive When Arc is Struck, Becomes Normal After Arc Burns Awhile (a) — This is due probably to a rheostat having cast iron grids. If the rheostats are of a large size they have the property of passing the current more freely when cold than when heated at which point their resistance is increased to the value at which they are rated. More ballast resistance may be required during the "cold period'' and, possibly, the ballast being used is out of circuit. Examine and correct it if the condition is likely to cause further trouble.