[Electric engineering.] . 1 W I Fig. 33. diameter and 8 inches long. This core is built up out of 46 INTERIOR WIRING. § 28 soft-iron wire and is wound with 5 or 6 layers of No. 18 mag-net wire. The coil k is connected in series with the cells r,as indicated in Fig. 33. The battery should have at least sixcells for satisfactory service. One end of the coil is con-nected to the gas pipe/. When the pendant is pulled, thetip makes contact and a current is established through thecircuit. When the circuit is broken, the self-induction ofcoil k causes a bright spark at the break. 65. Wires for this p
[Electric engineering.] . 1 W I Fig. 33. diameter and 8 inches long. This core is built up out of 46 INTERIOR WIRING. § 28 soft-iron wire and is wound with 5 or 6 layers of No. 18 mag-net wire. The coil k is connected in series with the cells r,as indicated in Fig. 33. The battery should have at least sixcells for satisfactory service. One end of the coil is con-nected to the gas pipe/. When the pendant is pulled, thetip makes contact and a current is established through thecircuit. When the circuit is broken, the self-induction ofcoil k causes a bright spark at the break. 65. Wires for this purpose are usually run on the out-side of the gas fixtures, but they may be concealed if thereis sufficient room between the fixture shells and the gaspipe. It is advisable to use wire provided with good insu-lation for this kind of work, for the wires are particularlylikely to become grounded upon the fixtures to which theyare fastened. Where fixtures are wired on the outside, thewires should be painted or made with the
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