generated in a day by the impact of the light layer of copper wire, in a spiral running east and west with 5. The electric belts, not only theoretically, but by actual waves upon the earth’s surface. respect to the imaginary poles. When completed, it was as practical experiment, as we have seen,… … tery, by changing the position of the needle with respect to In Fig. 1 is seen the suspended magnetized needle with its the north and south poles, and by so connecting the battery poles parallel to the wire. In Fig. 2 is seen the result when with different parts of the helix surrounding the…
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