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88 MOTION PICTURE HANDBOOK
Wire Terminals
EVERY wire ought to have a terminal lug, and; except in cases where the same will be subjected to heat, as, for instance, in a lamphouse or on a rheostat, these lugs should be soldered to the wire. They come in a number of forms, but almost any of them will serve the purpose very well if properly attached to the wire. In order to solder a lug to the wire proceed as follows: First measure the depth of socket in the lug, and cut off enough of the insulation of the wire to just let the end of the wire reach the bottom, scraping the bare end of the wire perfectly clean, until it shines. This latter is important, since otherwise the wire cannot make perfect electrical contact with the solder. Next, first having made sure the inside of the wire socket is perfectly clean, hold the lug in the flame of .a blow-torch or some other source of heat and melt sufficient solder into it to fill the hole .about half full. Don't get the terminal too hot, but just hot enough to make the solder thoroughly liiquid. Now, having put a little flux on the bare part of the wire, shove it down into the solder and hold it until it sets.
Caution.— Don't shove the wire into the lug with a quick push. If you do the solder will probably squirt out, and you may get badly burned. Warm the end of the wire and then shove it in firmly, but not too fast. If directions are followed you will have a perfect electrical joint. In attaching terminal lugs to binding posts always be sure that both the lug and binding post are perfectly clean. A little No. 0 sandpaper or emery cloth will be found handy for cleaning contacts; also you can scrape them with a knife blade.. It is, however, exceedingly important that when a copper wire is joined directly to a -binding post it be perfectly clean, since ofttimes a thin coating of oxidation will cover the metal, and this coating, while it is almost thin enough to be invisible, offers high resistance. The resistance of one such joint would not amount to very much, but that of a dozen would cost you a good many dollars in wasted energy in the course of the year — remember that your meter registers all energy consumed, whether it be used in overcoming useless resistance or in the production of light and power.