Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 133
e, is not right for direct current. In order to coaxthe arc forward, it will be necessary to put the upper car- 126 MOTION PICTURE ELECTRICITY bon slightly behind the lower, something like the illustra-ti n shown in Fig. 66. This matter of adjusting the carbons for different ma-hine positions is of… … For advertising purposes it is sometimes necessary toput the projector in a position where it will show a pic-ture immediately below the machine or stereopticon. Forinstance, if it should be required to throw a picture on asidewalk, then the lamp would have to set with the con-densing lenses facing…
Motion picture theaters · Electric lighting
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