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Knight's Mechanical Encyclopedia (ed. Knight), I. (search)
00 feet and the secondary about 44 1/2 miles in length. This projects a spark 21 inches in length and capable of penetrating glass three inches thick. Another, at the Polytechnic Institute of London, has its primary wire 3,777 yards long, and weighing 145 pounds. The induction-wire is 150 miles long. This projects a spark 29 inches long, penetrating 5 inches of plate-glass. Its calorific effects are very intense, the most refractory substances, as platinum, being fused with ease. In Kidder's induction-coil, the secondary helix or helixes are adjustable, so that they may be either concentrated at the central or neutral portion of the primary coil or placed toward the poles, so as to vary the power of the induced currents. See Noad's Inductorium. Induction-coil. Electrical machines of great power are now constructed on the induction principle. In-duc′tion-pipe. （Steam-engine.) The pipe which leads the live steam to the cylinder. In-duc′tion-valve. The valve<