Motion picture handbook; a guide for managers and operators of motion picture theatres (1910)

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FOR MANAGERS AND OPERATORS 87 positive to the upper. There are several methods of ascer- taining which is the negative and which the positive wire, but the following is simplest: Connect one wire from one binding post of operating switch to lower binding post of lamp. Connect other wire through the rheostat to upper lamp binding post. Now, first being sure the resistance is in if using an adjustable rheostat, close the switch and