Sheraton, Thomas; Bensley, Thomas; Mathews, James; Bensley, Thomas [Oth.]; Mathews, James [Oth.]; Terry, George [Oth.]; Jordan, Jeremiah Samuel [Oth.]; Wayland, L. [Oth.]: The Cabinet-Maker And Upholsterer's Drawing-Book: In Three Parts (London: Printed For The Author, By T. Bensley; And Sold By J. Mathews ... C. Terry ... J.S. Jordan ... L. Wayland ... And By The Author, 1793)

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the picture, and d the diftance; therefore, in future, the expla-
nation of thefe may be omitted, and we may proceed as
follows:
Operation.—Draw the perpendicular A D equal to the fides
of the original fquare, and draw the vifuals D s, A j. Then, on
the ground line G R, lay on a fpace from i to C equal to the
diftance of the fquare from the front of the picture. Make C N
equal A D, and draw C d, N d, cutting the vifual A j* in I and M.
Laftly, from I and M raife perpendiculars to K L, and the fquare
will be reprefented as required.
Obfervations.—The iides IK, ML, are perpendicular to the
ground; wherefore, according to Cafe 4, page 216, they are the
reprefentations of lines originally perpendicular, as AD; and
being perpendicular to the ground, confequently they are pa-
rallel to the picture, and therefore can have no vanifhing point.
But the fides K L, IM, are perpendicular to the pi&ure; there-
fore they vanifh to the center..

Prop.,,