Modern magic. : A practical treatise on the art of conjuring. (1885)
Hoffmann, Professor, 1839-1919, Hawkins, Arthur, ca. 1940 · London ; New York : G. Routledge and Sons · leaf 509
oved, a hollow is made in the frame which supports it, and inthe cavity thus made is fixed an electro-magnet, of the fashion shownin Figs. 304, 305. Upon one side of the horseshoe, at the centre ofthe curve, is screwed a brass spring a, to the opposite end of which isattached the keeper b. The… … shoe becoming magnetic, the keeper, in spite of the resistance of thespring, is brought down sharply into contact with the poles, and so remains until the circuit is againsevered, whtn it flies back again toits former position. The littlemetal knob or hammer c, which is toproduce the raps, is…
Magic tricks
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