Ericsson, John, 1803-1889 · New York : Printed for the author at "The Nation" Press · leaf 155
of the 126 RADIANT HEAT. area of the solar disc, transmits 0.638 of the intensity trans-mitted from an equal area at the centre of the disc. Ofcourse it will be supposed that the rate of the diminutionof intensity within the zone thus ascertained is much greaternear the border of the photosphere… … the truth of the indications referred to, sho\ving considerableradiant energy at the border of the photosphere, a very carefulinvestigation was made, Sept. 9, 1875, by means of screensexcluding the rays from the solar disc, as shown in Figs. 12and 13. The diameter of the screen represented in Fig.…
