Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 541
or core, which is connected at one end, by athick disc of iron, to an iron tube surrounding the coiland bar. The free circular end of the tube constitutesone pole of the electro magnet, and the adjacent freeend of the bar core the other. A thin circular iron discheld (pressed against the end of the… … External appearance of BellTelephone.
Scientific recreations
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