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FOR MANAGERS AND OPERATORS 157 colors of bell wire. The reason for three colors is to avoid mistakes and confusion and to be able to find any particular wire anywhere afterwards, without tracing it clear from the battery or bell. The use of three colors of wire simplifies matters exceedingly. Suppose you get red, blue and white. You take one color, say the blue, and run it from one (either) binding post of the battery, to one (either) binding post of each bell. You may run separate wires from the battery binding post to each bell or run one wire reaching all bells or you may branch off to a bell at any point. Next take another color (red, for instance) and run from the other battery binding post to one (either) side of each push button. You now have one side of the battery connected to one side of each bell and the other side Oi! the battery connected to one side of each push button. You next, with the remaining color (white) wire, connect the remaining side of each push button with the remaining side of the bell it is to ring, and the job is done. The blue wire (blue in this case) is called the common bell wire, the red wire is called the push button wire and the whites are called the individual wires. It is these latter wires which determine which bell a button will ring and you may cause a button to ring a different bell by simply changing the individual wire to that bell. Fig. 41 shows a plan of this system. In running your wires they may be, except as before noted, simply stapled to the wood- work with small staples, but you should never run two wires under one staple, since if you drive the staple a trifle tight you may form a short circuit through the iron of the staple. Then, too, if a wire is in a place where it will swing a little the insulation is likely to wear through, thus form- ing a short circuit even though not clamped tightly by the staple. A short circuit may cause your bell to ring all the time or not ring at all, according to its location. If on the two wires leading to the push button the bell will ring con- tinuously until the battery is worn out. If on the wire running from bell to battery and the wire running from but- ton to bell the bell won't ring at all. Several wires may be run together in a bunch by using wood cleats. An addi- tional bell or buzzer may be installed at any time as follows: Test the bell and install it and its push button wherever you want them to be. Now with a piece of first color wire