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 165
148 DAVISS MANUAL. them nearly equally to the influence of the magnet,the attraction becomes scarcely perceptible. Thus,let M (Fig. 98) be the south pole of a bar or horse- Fig. 98. … shoe magnet, and A a piece of sheetiron somewhat smaller than theend of the magnet. When thisiron plate is placed in the positionrepresented in the upper figure, thesurface next the pole of the magnetacquires north polarity, while theopposite surface becomes south,and, the iron being thin, the…
