These are usually of lower voltage, fifty-five or thereabouts.
In these instances we resort to a method known as wiring in series, which is done as in Fig. 4.
Of course the number of lamps to a series is to be governed entirely by the voltage, and the trimmer must resort to his own judgment in determining this.
You will see by the diagram in Fig. 4 that you have two lights for each connection with your lead wires, therefore, if using a 220-volt circuit and 110-volt lamps you have each connection using the full 220 volts, otherwise your lamps would soon burn out, as every connection must consume as many volts as your circuit carries.
Special Designs.—These few instructions answer for a single string of lights, such as a circle, arch, cornice, etc., where your leads run uninterruptedly from first to last lamp; but “how about a design that is impossible to wire that way?” you ask. It is simple, and I have made a few diagrams to illustrate the method employed.
You may have a cornice about your windows, and must bring your wires from the corner. Fig. 5 will show how to do it. A cross, or such designs as have two breaks, are wired as in Fig. 6.
Again, you may wish to use more than one design in a window; for example, you may have three circles, one at back and one at either side. Fig. 7 shows the easiest method.
These principles apply to many varieties of designs, and it is only the principles I am endeavoring to make plain.
And now I will give a few hints or, better yet, some don’ts which will be valuable for amateurs.