Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 503
nitrite of amyl, and broughtdown upon itself a shower of particles -vhicb flash forthlike a solid luminous spear. This experiment, moreover,illustrates the fact, that however intense a beam of lightmay be, it remains invisible unless it has something toshine upon. Space, though traversed by the… … lect. xvr. NITRITE OF AMYL VAPOUR. 479 most distent from the lamp is free from cloud. Now thenitrite of amyl vapour is there also, but it is unaffected bythe powerful beam passing through it. Let us recon-centrate the transmitted beam by receiving it on a con-cave silvered mirror, and cause it to…
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