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

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FOR MANAGERS AND OPERATORS 13 nating is used but one current neutralizes the other so that, as a matter of fact, this induced current is not recorded by the meter nor does any reach the earth by way of the conduit, unless the wire insulation and conduit insulation is imperfect allowing actual contact between a raw wire and the metal of the conduit. A technical explanation of the reasons for this would be beyond even the average electrician and will therefore not be given. Suffice to say this is the fact. In running your house or operating room circuits run the wires as directly as possible, stretch them tightly and fasten them se- curely to porcelain insulators, types of which are shown in Fig. i. It is best to keep the wires of a circuit not less than 2V2 inches or 3 inches apart. The insulating knobs may be fastened to the wall or ceiling either by nails or suitable screws. If nails are used cut out a circular piece of heavy leather V2 to % inch in diameter and drive the nail through it first. This acts as a cushion and you can drive the nail down tight on the head of the insulator without breaking the porcelain. Allow your wires Iā€”I Porcelain insulators. 2 Rubber tubing. 3ā€”4 Wires, 5ā€”5 Tape to hold tubing in place.