Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 206
While balanced, as inFig. 175, test the polarity of the bar by a compass, and it ismagnetised by induction, ^[ 36, with the polarities as shown.Note that part of the magnetic lines from the solenoid com-plete their circuit through the core, entering at its upper end, ELECTROMAGXETS. IS/ which is… … considerably in-creased, as notedby the additionalweights required tobe added to bal-ance the currentsattractive force.The strongest pullwill take place when the middle of the iron core nearlycoincides with the middle of the solenoid,as when they coincide the greatest numberof the currents magnetic…
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
