Motion picture projection; an elementary text-book (1921)

Record Details:

Title:
Motion picture projection; an elementary text-book
Date:
1921
Publisher:
New York, Theatre Supply Co.
Volume:
Motion picture projection; an elementary text-book
Leaf #:
00078
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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MOTION PICTURE PROJECTION 77 peres, can carry that 20 amperes at a pressure of 10 volts o-r 10,000 volts, and as electrical energy is equal to the amount of current multiplied by the voltage, it will readily be seen that the transmitting capacity of a current can be greatly increased by increasing the voltage without increasing the size of the conductor. However, incandescent lamps are usually made for use on a pressure of 110 volts, so it would be necessary to either cut down the voltage to this pressure or connect a number of the lamps in series to take care of the extra pressure. Fig. 1 shows two 110 volt dynamos A and B supplying two independent circuits. In each case five ( > ito Fie £.