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

Fig. 37.

As it is given in magnitude, its diameters must be given at the base and summit, A B and C D; and its vertical height, C E.[Footnote 24] ]

And as it is given in position, the center of its base must be given.

Fig. 38.

Draw in position, about this center,[Footnote 25] ] the square pillar [p48] ]

a f d

, [Fig. 38.], making its height,

b g

, equal to C E; and its side,