Electric toy making for amateurs. This work treats on the making of electrical toys, electrical apparatus, motors, dynamos and instruments in general ... By T. O'Conor Sloane .. (1914)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, The N.W. Henley publishing co. · leaf 44
bout the last degreeof solidification. The Magic Circle. The magic circle next illustrated is designed foruse with a small magnetizing coil. It is simply twosemi-circles of soft annealed iron, provided with ringsor handles exactly at the centre of each piece. The THE MAGIC CIRCLE. 43 faces are… … Fig. 15. The Magic Circle. into forty or fifty turns, suffices. With a current ofgood strength the attraction the circles will developis surprising. Magnetic Hemispheres. A very peculiar form of magnet is shown in thenext cut. Although a modification of it is attributedto Prof. Forbes, by Thompson…
Electric apparatus and appliances · Electric toys
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