Word: helix
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Dates: during 1930-1939
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...greatest discovery, which ultimately resulted in the electric generator, he wrote: ". . . had an iron ring made. . . . Wound it with many coils of copper wire, one-half of them being separated by twine and calico. When all was ready . . . the battery was communicated with [the end of one coil]. . . . The helix strongly attracted the needle of [a galvanometre...