A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1859)
Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 22
gure, one plane is placed horizontally,and the other perpendicular to it They aretherefore perpendicular to each other, howeverthey may stand in relation to the observer. Inclined Planes are such asare inclined toward, and cuteach other obliquely. The Angle of Inclination isthe angle contained… … 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. CONVEX AND CONCAVE SURFACES. 15. Spheres,and Spheroids. Hemispheres,
Astronomy
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