Smart, Edward Howard · London : Macmillian and Co. · leaf 110
right angles, and the figure will be a square. By § 4 these projections can be simultaneously made. P.O. 82 PROJECTIVE GEOMETRY § 7. Proof by Projection of the Harmonic Propertyof the Complete Quadrilateral. Projecting the third diagonal FGH (Fig. 40) to infinity, thefigure becomes a parallelogram… … Fig. 41 .*. the ranges which project into these must be harmonicalso; .. DKBG and AKCH are harmonic (Fig. 40). .. the range FGEH, which is a section of the pencil D(AKCH),is harmonic. § 8. The Drawing of Projections. It is desirable that at this stage the student should be ableto draw for himself…
Geometry, Projective
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