Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 282
rical Trigonometry many properties of sphericaltriangles become at once clear when stereographically projected,because the angle between any two circles on the surface of thesphere forms the same angle when reproduced on the plane ofprojection; so it is especially useful in solving the problems… … circles on the exterior of the sphere ABDPC, and EF the planeof projection passing through the centre of the sphere, of whichP is the pole or centre of projection. Then ah is the projection of the circle AB, and cd. of thecircle CD on the plane of projection. 262 SOLID GEOMETRY HELICES. Peoblem 50.…
Geometrical drawing
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