Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

Record Details:

Title:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Date:
[c1916]
Publisher:
New York City, The Moving Picture World
Volume:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Leaf #:
000435
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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416 MOTION PICTURE HANDBOOK from 20 to 30, on the 25 ampere size ; from 30 to 40 amperes on the 35 ampere size, and from 40 to 60 on the 50 ampere size. It is,' of course, possible to secure lower ampere output than specified as a minimum with any of the above machines by the use of special controllers, which can be furnished upon request. Fig. 205 illustrates the Hallberg D. C. economizer as made for voltages ranging from 200 to 750. This outfit is a straight motor LINE ruses 15AM PS. row I (0 VOL.T& 10 • • 220 • 5 • 550 CURRENT AT ARC tS ADJUSTABLE FROM 2O TO Figure 204. generator set, in which, however, the generator is of special construction delivering a steady ampere flow to the arc without the use of a rheostat. The 200 to 750 volt outfit is also furnished complete with automatic starter and light controller, and besides this outfit has a pully coupling between the motor and generator on which, in special cases, a belt may be placed for driving the economizer by means of an engine, which would make the economizer operate a motion picture arc just as it does when driven from an electric circuit, and at the same time from the high voltage side current can be taken for driving fan motors, or a limited number of lamps. This is an important feature and might, under some circumstances, be of considerable value to an exhibitor. Another feature of construction is that the low voltage side of the economizer is a separate unit which can be run as an ordinary dynamo by an engine ranging from 3 to 6 horsepower in capacity