Motion Picture Handbook (second edition) (1912)

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170 MOTION PICTURE HANDBOOK 220 volts, it being of course understood that for no volt current you must have a no volt inductor, and for 220 volt current you must have a 220 volt inductor. The device may, however, be used on pressure ranging from 10 per cent below to 10 per cent, above the voltage for which it is rated, but in the one case there will be a corresponding increase and in the other a corresponding decrease in amperage as per its rated capacity. The inductor is designed for a maximum temperature rise of 50 degrees, Fahrenheit, above the surrounding atmosphere, and will usually operate at a temperature rise of not to exceed 30 degrees. The inductor weighs about 104 pounds; is 19 inches high and occupies 12 x 14 inches floor space. Its manufacturers claim an efficiency of 97 per cent. Power's Little Giant. — Power's Little Giant has the same electrical action, same mechanical design as has the inductor before described, but it is not provided with a case and has no adjustment switch. Different amperage is obtained by changing the connections. The two leads not in use should have their ends tapped over so as to have their ends unexposed. The secondary leads are marked "lamp" and the lamp leads should be connected directly thereto. Switch and fuses, being on the line side, where an adjustment of the amperage at the arc is not efficient.