Simplified mechanical perspective for the use of ... schools (1909)
Frederick, Frank Forrest, 1866-1942 · Peoria, Ill., The Manual arts press · leaf 51
*.retreating ob-lique line, butthey both liein the same vertical plane. Planeshave their vanishing traces as lineshave their vanishing points. H isthe vanishing trace of all horizon-tal planes. A vertical drawn thruV. P. L. is the vanishing trace ofthe vertical plane of which the tri-angle 1-2-3… … ..1VPL Ho.15. 45 \ Tr.VPl. 45\ \i iii ii> tft S 7. 46 TTcj.16. THE PERSPECTIVE OF OBLIQUE LINES. trace above V. P. L. and the vanishing point of 3-2 and 5-6 must bebelow V. P. L. If the vertical plane containing triangle 1-2-3 be revolved to co-incide with the V. PL the true angle made with the…
Perspective
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