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The elements of perspective : arranged for the use of schools and intended to be read in connexion with the first three books of Euclid (1859)

Ruskin, John, 1819-1900 · London : Smith, Elder · leaf 144

An illustration from The elements of perspective : arranged for the use of schools and intended to be read in connexion with the first three books of Euclid, 1859, leaf 144 — fApp. I. 122 PRACTICE AND OBSERVATIONS diameters of squares which are cut off between the circles represent radiating planes, occupying the position of the spokes of a wheel. Now let the line aeb, Fig. 69., be the profile of the vase or cup to be drawn. … Enclose it in the rectangle c d, and if any portion of it is not curved, as a e, cut off the curved portion by the vertical line E r, so as to include it in the smaller rect¬ angle FD. Draw the rectangle acbd in position, and upon it construct two squares, as they are constructed on the rectangle…

Perspective

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