Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 29
Sphere. A sphere is a solid figure described by the rev-olution of a semicircle about its diameter, whichremains fixed—Fig. 54, The axis of a sphere is the fixed straight lineabout which the semicircle revolves. The center of a sphere is the same as that ofthe semicircle. The diameter of a sphere…
Mechanical drawing · Machine design
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