Perspective and geometrical drawing : adapted to the use of candidates for second and third-class teachers' certificates (1887)
McGuirl, Thos. H. (Thomas H.) · Toronto, Ont. : W. Briggs · leaf 96
r greatest length.Again, if AB represent a line ofdefinite length, and O, the ob-server, the apparent length ofAB as seen from O will be AD.(Fig. 55.) This representation of a lineAB by AD, which is always lessthan AB, is called foreshorten-ing. Note.—AD is always perpen-dicular to the longest side… … Fig. 56. Here, the figure BX only, would be given, and it would beassumed to touch the picture plane. We first produce thevanishing lines DX and AC to meet in C.V., then drawC.V. S perpendicular to B.L., and make it equal to height ofspectator; then draw H.L. parallel to B.L. through C.V.;next take…
Geometrical drawing · Perspective
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