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 #:
000524
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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426 HANDBOOK OF PROJECTION FOR provided each individual rheostat has sufficient resistance to oppose the line voltage without overload, and further provided that the resultant amperage be not great enough to overload the circuit wires, arc lamp or apparatus. For instance, a 10 ampere, a 50 ampere and a 25 ampere 110 volt rheostat may be connected in multiple on 110 volts. The result would be a current flow equal to the combined amperage capacity of the rheostats, or 10+504-25=85 amperes, hence the circuit wires etc. must have at least 85 amperes capacity. You may use a 220 volt rheostat on 110 volts, or on any other voltage not in excess of 220. You would not, however, £>r#w -+ fyn. ,rfjn rnn . ff H \ Figure 137. get amperage equal to the rated capacity of the rheostat except on 220 volts. You cannot, however, connect 110 volt rheostats either singly or in multiple on 220 volts, because they have not sufficient resistance to withstand that pressure. If 110 volt rheostats were connected either singly or in multiple on 220 volts the coils or grids would get white hot and burn out very quickly. You may, however, connect two 110 volt rheostats in series on 220 volts, by reason of the fact that you would in effect be making one rheostat out of the two, thus presenting double the resistance required for 110 volts. Two 110 volt rheostats connected in series would, however, be