Motion picture electricity (1914) (14781723854)

Identifier: motionpictureele00hall (find matches)

Title: Motion picture electricity

Year: 1914 (1910s)

Authors: Hallberg, Josef Henrik, 1874-

Subjects: Motion picture theaters Electric lighting

Publisher: New York city, The Moving picture world

Contributing Library: The Library of Congress

Digitizing Sponsor: The Library of Congress

Text Appearing Before Image:

Fig. 123 the lines of a motor generator, is in the strict sense of theword only in part a motor generator. The principle in-volved permits the use of smaller and more efficient motorand generator than could possibly be had if the apparatuswas a straight motor generator set. The no-volt outfitis provided with an automatic starting box and light con-troller by means of which the operator can vary the am-peres at the arc anywheres from 20 to 30 on the 25-am-pere 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, 212 MOTION PICTURE ELECTRICITY

Text Appearing After Image:

MOTION PICTURE ELECTRICITY 213 possible to secure lower ampere output than specified asa minimum with any of the above machines, by the useof special light controllers which can be furnished uponrequest. Fig. 124 illustrates the Hallberg direct current econ-omizer as made for voltages ranging from 200 to 750, andthis outfit is a straight motor generator set in which, how-ever, the generator is of special construction, delivering asteady ampere flow to the arc without the use of a rheo-stat. The 200 to 750-volt outfit is also furnished com-plete with automatic starter and light controller, and be-sides this outfit has a pulley coupling between the motorand generator on which, in special cases, a belt may beplaced for driving the economizer by means of an engine,which would make the economizer operate a motion pic-ture arc just as it does when driven from an electric cir-cuit, and at the same time from the high voltage side cur-rent can be taken for driving fan motors, or a limitednumbe

electric lighting motion picture electricity 1914 book illustrations images from internet archive library of congress

1914

Library of Congress

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