Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 210
ectromagnet withcomparatively long limbs to accommodate the windings,because it requires a great many turns of wire to providesufficient exciting power to drive the lines of force throughthe air. To obtain a gentle pull over a long range, asolenoid or long tubular coil and a long movable core is… … Fig. 183.—Electromagnet withthe Coil on the Yoke. Fig. 184.—Straight Wire Electromagnet. as in No. 2, Fig. 181. In No. 7 of Fig. 181,the winding is containedon a bobbin mounted onone spool. As muchwire is required as if two spools were used, but one bobbin issaved. To be efficient the wire should…
Electricity · Magnetism
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