Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 238
228 ELECTEICITY. … Fig. 271. two side by side withtheir poles in opposite di-rections,Fig. 274. Piecesof iron are then placedfrom pole to pole. 769. Theory of Mag-netism. The differencebetween a magnetised and an unmagnetised bar is notfully understood. The probable explanation would seemto be .connected with the…
Physics
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