Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 18
Fig. 6 … 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…
Astronomy
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