Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 452
e steadily in-creased, as shown by the increased height of the curve.At d the visible spectrum ceased, but an invisible oneextended beyond d to a, where it vanished. According,then, to the observations of Sir William Herschel, thewhite space b d e represents the thermal value of thevisible, while… … the distribution of heat in the solar spectrum. The resultsof his observations are rendered graphically in fig. 112,where the area d c e represents the visible, and A b c d theinvisible radiation. Before proceeding to our own measurements, it isdesirable to make a few remarks upon the generation…
Heat
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