Second grade perspective, (theory and practice) : specially prepared for the use of art students (1893)
Dennis, H. J · London : Baillière, Tindall, and Cox · leaf 18
ane picture-plane, but make certain angles . 4 pap rdicular to thas plane. with the ground-plane. a Let OP, QR, Fic. 9, be the profile of two Ill. A plane may be parallel, per- planes at right angles to pendicular, or inclined to the picture-plane, each other.’ Point A is A plane parallel to the… … make any angle with the ground. (See Fic. 10.) A plane perpendicular to the picture-plane may be parallel, perpendiculat. The ground-plane is given, and the picture-plane supposed to stand rertically upon the line O P, as shown by the dotted lines. on «nclined to the ground at any angle whatever.…
Perspective
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
