Graphics : a manual of drawing and writing, for the use of schools and families (1838)
Peale, Rembrandt, 1778-1860, author · Philadelphia : J. Whetham · leaf 32
26 MANUAL OF DRAWING. REGULAR TRIANGLES. … The eye must be accustomed to notice the proportions of different angles, and always to refer them to some sim¬ ple elements or principles ; as, the triangle whose sides are of equal length, as fig. 1 ; the triangle, one of whose corners is a right angle or square, as fig. 2; or the trian¬ gles of…
Drawing -- Study and teaching · Penmanship -- Study and teaching
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
