Smart, Edward Howard · London : Macmillian and Co. · leaf 111
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 the actual forms of the projected figures.We proceed to explain how this may be done. It will be found helpful to construct a model… … Fig. 42. Now let tt be turned about its common section with ttuntil it coincides with tt. This process is called rabattingthe plane of projection into the plane of the figure. As this is done, the opposite side of the box—the planethrough V and the vanishing line of tt—will turn about thisvanishing…
Geometry, Projective
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