Graphics : a manual of drawing and writing, for the use of schools and families (1838)
Peale, Rembrandt, 1778-1860, author · Philadelphia : J. Whetham · leaf 30
24 MANUAL OF DRAWING. RIGHT ANGLE AND DIAGONAL. … The previous lesson is exemplified in this diagram. Draw a perpendicular ; then connect it with a horizon¬ tal of equal length. Although the eye cannot, at first, instantly perceive when the perpendicular and horizon¬ tal lines are made of equal length, running as they do in different directions,…
Drawing -- Study and teaching · Penmanship -- Study and teaching
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Preclarissimũ opus elemento[rum]](https://img.insideoutlibrary.com/img/200/ia-gri_000033125009354198-88-1.webp)
