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18 MOTION PICTURE HANDBOOK an ins';latin£i k.io!). U;e wire (\vit!ic'.:t removing the insulation) the same si;-,' :.. the line yon are tying. At "D" is seen the nci 1 ^^SBfe^ess^ Qj > proper me'.'-'d cf :r.:,!.;n2 a splice in a twin wire. When the joint is done i and 2 should be wrapped with insulating tape after which the whole length from which the outer insulation has been removed must be thoroughly taped. Twin wires (two insulated wires enclosed in one outer insulation) should be used only in metal conduits. To make a splice in a flexible cable strip the insulation from about three inches of each end. Clean the strands thoroughly and separate the wires of each end into about four equal parts two-thirds of the way back to the in- sulation. Now put the ends together so that the strands of each end will come between each other and wrap them down tight and solder. Before making a wire joint always CLEAN THE WIRES PERFECTLY, scraping them until they shine. It is impossible to make good electrical contact unless the metal is perfectly clean. After making a wire joint always cover with insulating tape at least as deep as the original insulation. To solder a joint first heat the wires with a gasoline torch and rub on a soldering compound, which may be had in stick form from electrical supply houses. Then, using solder wire, melt sufficient solder by holding the solder to the joint and playing the flame on it to thoroughly fill the splice. Care should be had not to heat the wires, especially if small ones, too hot, as it has a tendency to weaken them. Those who cannot secure soldering compound may make a flux as follows: Saturated so- lution of zinc chloride 5 parts, alcohol 4 parts and glycerine i part. A well-made joint may be used temporarily without solder- ing, but a permanent joint should ALWAYS BE SOLDERED.