Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity (1854)
Davis, Daniel · Boston : Palmer and Hall · leaf 140
REVOLVING COIL AND MAGNET. 123 … this instance the magnets rotate also. For this pur-pose, they are made of thin steel, and bent into a semi-2?Yo.. 73. circular form. The two are connected by stripsof brass, so as to form acircle, the similar polesbeing near each other,as indicated by the let-ters in the cut. Thiscircle is a…
