Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
d, and to act with the greatest energy, attwo opposite extremities. These are termed ;jo/es(512). If a piece of the ore, as shown, be laid down ona piece of board, and the board floated on water,the lodestone will invariably arrange itself so thatthe same pole will be directed to the north andthe… … 338 MAGNETISM. 601. Figure 34.—The armature.—The effective power of thelodestone is improved by rneaus of what is termed an armatiire ; which Fig. 34
Physics · Astronomy
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