. A sheet of copper net is made of twenty thicknesses of ordinary one inch hoop iron, about 1-20 inch.thick, thus making a rectan- moved back and forth between the pole pieces offers a sensible resistance. gular U-shaped core one inch square. The parallel arms Most experiments in diamagnetism may… … Fig. L—ELECTRO-MAGNET PARTLY IN SECTION. formed with this magnet. Short bars of various metals fitted to and'supported by arectangular wooden block. may be suspended,:by means of a silk fiber, between When the core has reached the required thickness, the the poles. Iron, nickel, cobalt, manganese,…
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