which is shown in Fig, 181, current volume), that every magnet is surrounded by a of which numerous bobbins or coils were revolved by steam 2. The grooves represented there serve for the recep- power. With 300 revolutions a minute, an electric light was field of force, consisting of lines of force… … posed to do away with the small magnet entirely. constructed his apparatus. THE GREAT ELECTRO-MAGNETS AT THE STEVENS INSTITUTE, The principle of this discovery was then shown That looked very much like perpetual motion. What is there to start the machine ? There is always enough re- by the lecturer…
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