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 203
same as with thebar inside of it; the magnetism was,however, much stronger when the barwas inserted in the coil. If suspendedor poised, see Fig. 148, the helix and itsiron core will take up a position in the earths field similar to thehelix or compass needle. It Avill also attract or repel the… … Fig. 172.—Current Anti-Clockwise—N-Polarity. ELECTROMA GNETS. 185
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer02inte-466-271.webp)