Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 296
MOTION PICTURE ELECTRICITY 289 … Not a FlickerOn the Picture when the light is projected by a direct-current arc lamp. Increase your patronage by using direct-currentlamps on alternating current supply circuitswith a — WestinghouseCooper-Hewitt Rectifier It changes alternating current to direct current. Therectifier occupies…
Motion picture theaters · Electric lighting
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