Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 154
ps, which connect the resistance plates together,have not become loosened—due to frequent expansionsand contraction. MOTION PICTURE ELECTRICITY 147 The rheostats so far mentioned, are of the non-adjust-able type. Under certain conditions it is necessary to usean adjustable rheostat, in which case,… … Fig. 84 Adjustable Type.—Fig. 84 illustrates the principleon which an adjustable rheostat works. By referring tothe diagram, it will be seen that the entire resistance unit,which may be of any type desired, is stretched out ormounted in suitable manner. The beginning end may beattached to one line…
Motion picture theaters · Electric lighting
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