Merchant, F. W. (Francis Walter), 1855-1937, Fessenden, Cortez, b. 1852 · Toronto : Copp, Clark · leaf 319
d 1 Experiment 2.—To Make a More Powerful Electro-Magnet Take a round bar of soft iron one-half inch in diameter andcut off a piece two inches long. Turn down the ends of thispiece for a distance of about one-quarter of an inch to three-eighths of an inch in diameter and fit tightly over each end…
Physics
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