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606
HANDBOOK OF PROJECTION FOR
wound on one side or leg of the core and the secondary on the other. The casing consists of a cast-iron front and back, with a perforated fibre cover. On the front, at the top, two wires emerge, underneath which, on the casting, is the word "lamp." These two wires connect directly to the carbon arms of the projector lamp. It makes no difference which wire you connect to the upper or lower
carbon arm. At the rear side, near the top, the two primary leads come out. They should be connected to the supply, as per Fig. 205, Page 607. On the face of the front casting is a handle which operates a singlepole knife switch, located on the opposite side of the casting. When this switch is thrown so that its finger points toward "high" you are getting the maximum amperage, approximately 65 if the supply voltage is 110. When it points to "medium" you are getting a medium amperage, and when it points to "low" you are getting lowest amperage transformer will supply. The inductor is designed for a maximum of 65 amperes on "high," 54 on "medium," and 45 on "low" when used on 110 or 220 volts, it being, of course, understood that you cannot use 110 volt inductor on 220, or a 220 on 110. In other words, you must have an inductor suitable to the voltage of your supply; also it must be suitable to the cycle of the current you use, though the inductor may be used on voltage ranging 10 per cent, below to 10 per cent, above that for which it is rated, but in one case there will be a corresponding increase, and in the other a decrease in its rated amperage. The inductor is designed for a maximum temperature rise of 50 degrees Fahrenheit above the surrounding atmosphere, and ordinarily its temperature will not exceed 30 degrees in excess of the surrounding air. It occupies 12 x 14 inches floor soace, is 19 inches high, and weighs approximately 100 lbs. Its efficiency rating will compare favorably with others.
Figure 204a