Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . 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 line 0 v, parallel to A B, would meet the. latter at infinity; therefore v, in the vanishing plane, 4>, would be the projection upon it of thepoin
Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . 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 line 0 v, parallel to A B, would meet 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 AB, exactly as mm in Fig. 92 is for A, B, and A, B,. Fig-- S7- A
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Keywords: ., bookcentury1800, bookdecade1890, booksubjec, booksubjectlettering
