. American telephone practice . FIG. VIEW OF INDUCTION FIG. 57.—PERSPECTIVE VIEW OF INDUCTION COIL. shown in Fig. 54, has. however, a few eccentricities which may proveinstructive. The core, C, is formed of a bundle of about 500 strandsof Xo. 24 B. & S. gauge Swedish iron wire, and is 4 inches in lengthand 9-16 of an inch in diameter. The spool is formed of a thinfiber tube, T, over the ends of which are slipped the heads. E, ofsimilar material, the parts being glued together. On this core arewound about 200 turns of Xo. 20 single silk-covered wire. This istwo layers deep,
. American telephone practice . FIG. VIEW OF INDUCTION FIG. 57.—PERSPECTIVE VIEW OF INDUCTION COIL. shown in Fig. 54, has. however, a few eccentricities which may proveinstructive. The core, C, is formed of a bundle of about 500 strandsof Xo. 24 B. & S. gauge Swedish iron wire, and is 4 inches in lengthand 9-16 of an inch in diameter. The spool is formed of a thinfiber tube, T, over the ends of which are slipped the heads. E, ofsimilar material, the parts being glued together. On this core arewound about 200 turns of Xo. 20 single silk-covered wire. This istwo layers deep, so that the ends of the primary both emerge fromthe same end of the coil. Over the primary winding are wrappedseveral layers of oiled paper, after which the secondary is wound,this consisting of about 1400 double turns of No. 34 wire, two inparallel. These two wires are wound side by side throughout their INDUCTION COILS. 75 length, and give the equivalent area of one No. 31 wire. The re-sistance of the primary coil is .38 ohm and that of the secondary75 ohms. The
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