a horseshoe, insulated it by a coating of varnish, and then It is fair to suppose that every mechanical inventor in Through the courtesy of Mr. R. H. Rose, photographer at Princeton, and by permission of Professor Schanck, of the these days of cheap machinery possesses some sort of a lathe, as… … versatility and inventive genius. disks of sheet metal nicked to a uniform depth from the > PROFESSOR HENRY’S BIG MAGNET. edge, and the arms thus formed are bent alternately in op- From the inquiries conducted by Prof. Hermann Cohn, posite directions, forming a groove for receiving the round of…
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