Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 19
Fig. 7 construct a small concave portion of a sphere, as in the accom-panying figure, which suggests how the position of the sun mightbe referred to the inside of a glass shell. LABORATORY ASTROXOMT But tlie hollow surface offers difficulty in construction andmanipulation, and it requires but… … and we can more readil}- get at it to measure it, and moreover canmore easily recognize the properties of the lines which we shallcome to draw upon it, since we are used to looking upon spheresfrom the outside rather than from the inside, except in the case ofthe celestial sphere. . On both Pigs. 7…
Astronomy
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