Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 187
way of dividing a circleafter ^reading the note On Wajrs^ofJReckoning Angles, p. log. CHAP. III.] ELECTRICITY AND MAGNETISM. 169 fneters devised by Sir. W. Thomson for signalling throughsubmarine cables, are admirable examples of this classof instrument. In Fig. 91 the general arrangements ofthis… … Fig. 91 of a light concave silvered glass mirror about as largeas a ten cent piece. This mirror is hung by a singlefibre of cocoon silk within the coil, and a curved magnet,which serves to counteract the magnetism of the earth,or to direct the needle, is carried upon a vertical supportabove.…
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
