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 64
EA R TH 5 MA QNETISM. 45 … Nfarinera Compass. permit the needle to come to rest pointing N and S, and thengently twist the box around until the point marked N on thescale, is directly under theN-pole of the needle. Thetrue geographical northwill then be so many de-grees east, or west of theposition the needle asstuneswhen…
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
