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
*See Section 787, ELECTRICITY. … 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
Physics
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