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FOR MANAGERS AND OPERATORS 363
FREDDY ECONOMIZER
The Freddy Economizer, the general appearance of which is shown in Plate 1, manufactured by Walter G. Preddy, San Francisco, consists primarily of two parts, viz., a heavy laminated sheet metal core, 16 inches in length, around which is placed a winding consisting of two layers of No. 4 magnet wire. The first or inner layer is wound directly over the core, but insulated therefrom. The second, or outer layer is wound over the first, and has brass taps brought out on every seventh turn. These taps are so arranged that the windings may be tapped at eleven points, thus providing for a greater or less amount of inductance, according to the number of amperes it is desired to use at the arc. The taps are labeled "contacts" in Plate 2, the wire terminating in an arrow head, labeled "clamp," connecting to one of the contacts. The two-screw connection at the top of the coil, and the brass tap at the same end, are at the extreme ends of the windings, all other taps being interposed, and acting to cut in or out a certain number of turns of wire, thus varying the inductive effect, and hence the amperage at the arc.
Plate 1, Figure 174.
The Preddy Economizer is an economy coil, inductance coil, reactance coil, or choke coil, those names meaning the same thing and applying equally to the same apparatus. The more familiar term is choke coil. There are no switches or levers to manipulate; all the regulation is perfected by means of the clamp and contacts, Plate 2, as already described. The connector (clamp) is merely a slotted brass casting that slips on the taps, and is then screwed tight by hand. CAUTION: Never use pliers in making this connection.
Directions. — The Preddy Economizer is not a transformer or auto-transformer, and has no "primary" or "secondary"