Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 496
hen placed in the dark. A simple way todo this is to expose clean oyster-shells to a red heat forhalf an hour. When cold, the best pieces are picked outand packed with alernate layers of sulphur in a crucible,and exposed to a red heat for an hour. When cold, themass is broken up, and the whitest… … 140 OPTICAL APPARATUS. bottle filled more than a hundred years ago still gives outlight when exposed to the sun, proving the persistencyof the property of reproducing light. Very many experi-ments have been more recently made in this direction,and the light-giving property greatly enhanced.…
Scientific recreations
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