Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 157
ustable rheostat is always preferable wherean adjustable type is not necessary. For the traveling show, however, an adjustable rhe-ostat constructed along the lines as illustrated in Fig. 85is very desirable, especially if the design is elaborate asin Fig. 86, which shows a complete interchangeable… … that all resistance units be made to pass the same numberof amperes unless the operator practices care in closingonly corresponding switches on each side of the rheostat,in which case it is permissible to make the resistanceunits of different degrees of resistance and capacity toallow for a varying…
Motion picture theaters · Electric lighting
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