Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 274
Fig. 324. passed through the Helix mounted on astand, Fig. 324, the bar of iron shows itsmagnetism by sustaining pieces of iron.If the opposite ends of the coil are wrappedin the opposite direction, one of the polesis in the middle of the iron, and the ends … become similar poles. 895. The Helix and Semicircular Rings, Fig. 325,act in the same way. When a current passesthrough the small coil of copper wire, the soft ironrings are magnetized, and can be separated withdifficulty. When not magnetized, they fall apartby their own weight. 896. The…
Physics
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