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 418
aces and point of contact of a T.P. to a givensphere ; the T.P. to contai7i a given line. Pig. 192. Note.—There are two T. planes that fulfil these conditions: TANGENT PLANES AND SOLIDS 397 one touches the upper surface of the sphere, aud the other itslower surface. Let A and A be the plan and… … Fig. 192. with their vertices on the given line, the intersection of thebases of these cones on the sj)here will be points in the T.planes. The projection of these cones will necessitate the drawingof the ellipses forming their bases; but it is possible to selectpositions by which we can dispense…
Geometrical drawing
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