A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 229
to keep the water in the calorimeterbox well stirred. At the end of the five minutes the screen is replacedand the rise of the temperature noted. The difference between this andthe change of the thermometer during the first five minutes will give us theamount by which a beam of sunlight one… … Fig. 120.— Pouillets Pyrhelioraeter. CORRECTION FOR ATMOSPHERIC ABSORPTION. 217 341. The second apparatus, Fig. 121, is the actinometer of Violle, whichconsists of two concentric metal spheres, the inner of which is blackened onthe inside, while the outer one is brightly polished, the space between…
Astronomy
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