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 #:
000534
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:
September 28, 2023
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436 HANDBOOK OF PROJECTION FOR they are thoroughly insulated from the frame, either by mica or asbestos, usually the former. RHEOSTATS FOR ROAD USE.— As between the grid and wire coil rheostat we would advise the wire coil for road use. This advice is based on the fact that by comparison the wire coil rheostat of given capacity is very much lighter in weight, little if any more bulky, and is much less liable to damage through heavy jars. For road use the International Projector Corporation make the wire coil rheostat illustrated in Fig. 141. This rheostat is made in two sizes, the smaller designed for 110 volts or less, while the large size may be H * B 5^ 5 <^ 1 I 1 I 4. c 7 | 5^ Figure 143. used on any voltage up to 240. Both these instruments are adjustable. The 240 volt rheostat is quite flexible, in that it consists of two separate and distinct banks of coils, connected by a jumper as per Fig. 142, either or both of which may be used separately, or the two may be connected in series or in multiple. Fig. 142 is the diagrammatic representation of this rheostat connected in two ways. The position of the adjusting lever in A places the two banks of resistance in series for use on 240 volts. The dial switch post in the center is connected directly with right hand binding post by means of a copper wire. As the lever is in diagram A, Fig. 142, the current en