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 31
bar magnet. Sometimes the needleis suspended from a vertical support by a cocoon silkfibre, in which case it is much more sensitive, due to theelimination of the friction in the poised form. Both typesare much used commercially in electrical detecting andmeasuring instruments, as in the mariners… … o=f }=o Fig. 19.—Magnetic Dip Needle. Fig. 20.—Magnetic I >ii> Needle. centre of the lozenge at right angles to it, and is held in posi-tion by brass V centres, or agate bearings, as shown in Figs.19 and 20. It is thus free to turn vertically. In some typesthe cradle holding the horizontal…
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
