Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 313
or surface obliquely, are re-flected from side to side of the tube, and thus enabled toreach the pile. The needle, which a moment ago showedno sensible action, moves promptly to its stops. These experiments illustrate sufficiently the reflectionof radiant heat by plane surfaces; let us turn for a… … distance of eighteen inches from the pile, whose conicalreflector is now removed. Unaided by the mirror therays from the ball produce scarcely any motion of theneedle. If the reflector, M N, were placed properly behind Fia. 91.
Heat
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
