Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 210
ectromagnet wdthcomparatively 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.—ElectroTnas:net withthe Coil on the Yoke. 3^ Fig. 184.—Straight Wire Electromagnet. magneticas in No. 2, Fig. 18L In No. 7 of^Fig. 181,the winding is containedon a bobbin mounted onone spool. As much wire is required as if tw^o spools were used, but one bobbin issaved. To be efficient the…
Electricity · Magnetism
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