Haswell, Charles Haynes, 1809- [from old catalog] · New York, Harper & brothers · leaf 286
MENSURATION OF SOLIDS. 281 Fig. 92. … SPHERICAL SECTOR. Definition.—A figure generated by the revolution of a sector of a circle about astraight line through the vertex of the sector as an axis. Note.—The arc of the sector generates the surface of a zone, termed the base ofthe sector of a sphere, and the radii generate the surfaces of…
Engineering · Mechanical engineering
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