Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 482
invisible rays.The light obtained by projecting the oxyhydrogen-flameupon compressed magnesia, after the manner of SignorCarlevaris, is whiter than that emitted by our lime ; butthe substance being light and spongy, its obscure radiationis surpassed by that of our more solid cylinders. The… … chamber, in which the platinised platinum-foil was exposed.Cutting off the visible rays by the solution of iodine, feeblebut distinct incandescence was there produced by the in-visible rays. To obtain a clearer sky, this mirror was transferred tothe garden of a friend near Chislehurst. A blackened…
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