Tyrwhitt, R. St. John (Richard St. John), 1827-1895, Macdonald, A. (Alexander), 1839-1921 · Oxford, The Clarendon press · leaf 173
a ccritralline; and a little below the lower side of the parallelogram is a pointon the perpendicular which is the origin of all the curves. Straight linosdrawn from thence wouUI make each of the halves of the large parallelo-gram into a square. Diagonals of those squares will give you a…
Painting -- Study and teaching · Perspective
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