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 #:
00094
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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78 RICIMRDSOX'S BIAJEBOOK OF PROJECTION circuit a conductor of comparatively high resistance which is not intended to produce light, heat or power or to perform any similar function, but merely to provide resistance which will oppose current flow and produce a voltage drop. Special units, called resistors, are made for this purpose. They are available in an enormous variety of sizes and materials. (54) A number of types of resistors are illustrated in Fig. 33. A represents a device wound of resistance wire (usually iron wire) on a ceramic core. Figs. 33 B and Figure 33 33 C are devices of very similar construction, but coated with enamel which assists in radiating away the heat that is generated by the passage of current. Figs. 33 D, 33 E, and 33 F are of moulded composition which can be used to produce high resistance — as high as 10 million ohms or more. Fig. 34 illustrates the iron coils and grids, often so large that a separate resistance room is provided for groups of them near the projection room, which are used to provide a voltage drop required for operation of d.c. projection arc lamps. By contrast, the