Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 214
ntil you have secured perfectlysteady burning. In a days operation, an operator sooncatches on to just the best way in each instance to secureproper results, and this information cannot be impartedin detail by any instructions from the maker. MOTION PICTURE ELECTRICITY 207 For detailed instructions… … well to operate the brushes with the least spring tensionwhich will give sparkless commutation. A stiff brushspring causes the brushes and commutator to wear exces-sively and at the same time is the cause of excessive heatat the commutator, due to friction. Stiff spring tension 203 MOTION PICTURE…
Motion picture theaters · Electric lighting
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