Wright, Mark R., 1854- · London : Longmans · leaf 239
Fig. 237. … Fig. 238.The same effect may be shown by insulating a piece of tintoil Electrolysis—Electro-Magnets 231 on a sheet of glass, and placing a needle across it (fig. 238); connectone end of the tinfoil to earth, the other to the prime conductor,and work the machine ; the needle becomes magnetised ; the…
Physics
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