A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 230
rmined bymaking observations at various altitudesof the sun between zenith and horizon.If the rays were homogeneous (that is,all of one wave-length), it would be comparatively easy to deduce the true correction and the true value ofthe solar constant. In fact, however, the visible solar spectrum is… … Fig. 121. — Violles Actinometer. 343. The Bolometer. — This he has done by means of his Bolometer,an instrument which is capable of indicating exceedingly minute changes inthe amount of radiation received by an extremely thin strip of metal. Thisstrip is so arranged that the least change in its…
Astronomy
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