A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1853)
Mattison, Hiram, 1811-1868 · New York, F. J. Huntingdon [etc.] · leaf 21
CONVEX AND CONCAVE SURFACES. … A Convex Surface is one thatis swollen out like the outside ofa bowl. A Concave Surface is one thatis hollowed out like the insideof a bowl. 15. Spheres, Hemispheres,and Spheroids. A Sphere is a globe or lall^ everypart of the surface of which is equidis-tant from a point within, called itscenter.…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
