Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 49
, which wouldbe correct for the current delivered to the line. Suppose, in Fig. 12, that instead of driving the magnetat a speed of 3,600 revolutions it be turned only 1,800revolutions per minute; then the number of alternationswould be 1,800 times 2 or 3,600 alternations per minute. Let us take… … ALTERNATIONS To figure the number of alternations deliveredper minute by an electric generator, multiply thenumber of magnet poles on the generator by thespeed in revolutions per minute. MOTION PICTURE ELECTRICITY 43 CYCLES PER SECOND When the number of alternations per minute isknown, the cycles…
Motion picture theaters · Electric lighting
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