F. H. Richardson's bluebook of projection (1942)

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1942
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
00095
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:
March 21, 2024
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ELECTRICAL APPARATUS COMPOS! 7Q resistor of Fig. 33 F is half the size of a match. Resis tors such as shown in Fig, 34 and in Fig. 33 A and 33 ( * are sometimes mounted in well ventilated metal coverings H Figure 34 so they cannot be touched, because they often operate with their resistance elements very hot. The covering also prevents any inflammable substance from contacting these resistors. Such resistors are ordinarily used only for controlling the voltage of d.c. ; they may be used on a.c, though only at very heavy waste of electric power as compared with the transformer. (55) Resistors are rated in terms of ohms, and of watts, the wattage rating referring to the power (1 x voltage drop) which the resistor can carry without overheating to the point where it sustains damage. When replacements are ordered the wattage must be specified, as well as the resistance ; and it is sometimes necessary to specify physical dimensions to make sure the replacement resistor will fit into the space allowed for it in a crowded amplifier or other apparatus unit. (56) Small resistors, of the types D, E and F in Fig. 33, are often color-coded to show their resistance in ohms. Painting colors on them makes the information relatively permanent where printed figures might in the course of time become obscured by dust or be destroyed by heat. The code involves use of ten colors, each referring to one number. The colors and their numbers are :