Six lectures on light : delivered in America in 1872-1878 (1886)
Tyndall, John, 1820-1893 · New York : D. Appleton · leaf 214
tion. • D-:fined in Lecture I. V. INVISI13LE IMACiES. POLARIZATION OF HEAT. 183 § 7. Tniisible Images formed hy Radiant Heat. Perhaps no experiment more conclusively proves thesubstantial identity of light and radiant heat, than theformation of invisible heat-images. Employing themirror already… … ray-fiiter, and placing at the focus a thin sheet ofplatinized platinum, the invisible rays declare theirpresence and distribution by stamping upon the plati-num a white-hot image of the carbons. (See fig. 53.) § 8. Polarization of Heat. Whether radiant heat be capable of polarization ornot was for…
Light
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