The Elements of Perspective / arranged for the use of schools and intended to be read in connection with the first three books of Euclid

by John Ruskin

being the center of the uppermost circle.

Fig. 69.

Within each of the smaller rectangles between the circles, draw the curve E B in perspective, as in [Fig. 69.]

Draw the curve

x y

, touching and inclosing the curves in the rectangles, and meeting the upper circle at

y

.[Footnote 32] ]

Then