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 30
v j … Pig. 17.—Compound Horseshoe Magnet With Keeper. Fig. 18.—Horizontal MagneticNeedle. piece of magnetised steel in the form of an elongated lozenge,in the centre of which a hole has been drilled, and a glass,agate, or brass V-shaped jewel affixed, so that the needle 12 PRACTICAL ELECTRICITY. will…
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
