Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 171
enable it to send out heat at the observed rate. The estimates of the temperature of the photosphere run all theway from the very low ones of some of the French physicists (who setit about 2500° C. — higher, but not vastly higher than that of an electricarc) to those of Secchi and Ericsson, who put… … § 218] INTENSITY OF SOLAR HEAT. 155 217. The Burning Lens.—A most impressive demonstra-tion of the intensity of the suns heat lies in the fact that inthe focus of a powerful burning lens all known substancesmelt and vaporize. Now at the focus of a lens the temperaturecan never more than equal that…
Astronomy · Constellations
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