Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ... draughtsmen .. (1897)
Willson, Frederick Newton, 1855-1939 · Princeton, N.J., The author · leaf 57
50 THEORETICAL AND PRACTICAL GRAPHICS. the centre of homology or perspective-centre. All points in the plane n are their own perspectives or, inother words, corresimid to themselves. Therefore B is one point of the projection or perspective ofthe line A B, being the intersection of A B with tt. The… … latter at infinity; therefore v, in the vanishing plane, 4>, would be the projection upon it of thepoint at infinity. Joining v with B and cutting v B by rays OA and OB gives A B as the relief-perspective of A B. The plane through 0 and A B cuts tt in B n, which is an axis of homology forAB and…
Mechanical drawing · Lettering
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