Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 433
es in the absence of the electric spark, when the box isperfectly dark. The box is open, and rests on the table,BD, to allow of changing the object. The conductingwires of electricity are at h and i; in the centre of thebox is a strip of cardboard, white on the side facing thespark, the light of… … Observation of electric spark. it was not entirely absent, but when it showed itself, itwas much more feeble and doubtful than usual, thoughthe intensity of light was quite sufficient to allow of theform of the object being very distinctly examined. Thustwo different phenomena have to be explained…
Scientific recreations
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