Richardson's handbook of projection (1927)

Record Details:

Title:
Richardson's handbook of projection
Date:
1927
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
00090
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 01, 2024
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540 HANDBOOK OF PROJECTION FOR SPARKING— See General Instruction No. 7. HEATING. That a motor or generator part feels hot to the sense of touch is no proof that anything is wrong. THE PERMISSIBLE TEMPERATURE OF PARTS IS 90 degrees Oentegrade, or 194 Farhenheit. For correct way of testing temperature of parts see page 511. If it is not higher than that above quoted you need have no worry. HEATING OF FIELD COILS may be due to a too-low speed of operation, to a too-high voltage, to brushes not correctly set, to the partial short-circuit of one coil, or to overload. HEATING OF ARMATURE may be due to overload, to a partial short-circuit of two coils, which will, of course, heat only the coils, affected, to short-circuits or grounds in armature windings or commutator, to poor commutation, or by high resistance connections. HEATING OF COMMUTATOR may be due to either overload, sparking, to a too-heavy brush pressure or high resistance connections between commutator and armature winding. BUCKING is the term used to describe arcing between adjacent brush arms. It is due to excessive voltage between commutator bars, or by abnormally low surface resistance on the commutator between brush-holders of opposite polarity. This condition may be due to (A) Rough or dirty commutator. (B) A drop of water reaching the commutator. (C) Short circuits on the line which produced excessive overloads. MUSCLE IS CHEAP. USE YOUR BRAINS.