Tissandier, Gaston, 1843-1899, Frith, Henry, 1840-, Harry Houdini Collection (Library of Congress) DLC · London, New York [etc.] Ward, Lock & Co · leaf 401
riment when great exactness is required ; but itis easy to calculate in a simple manner the differences inordinary lights. Supposing we desire to test the value oflight given by a lamp and a wax candle, they must both 44 LIGHT. be placed on the table at an equal height, B and A, infront of some… … Grotesque efTects of curved surfaces. same intensity, by advancing or withdrawing one of thetwo sources of light. The intensities of the two lightswill then be inversely proportional to the squares of themeasured distances, A B and AC. By a similar carefulcalculation it has been possible to draw up…
Scientific recreations
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