Francœur, L.-B. (Louis-Benjamin), 1773-1849, Fowle, William Bentley, 1795-1865. Elements of linear perspective · Boston : Hilliard, Gray, Little & Wilkins · leaf 19
measure one inch and two tenths; oneinch; and eight tenths of an inch.” 35. Make an equilateral triangle. (fig. 20.) After the pupil makes the figures exactly, let the length of the sides he given, as one, two, three, &c. inches. Then require the point to be under the base, turned to the right, &c.… … 38. Make a Rhomb or Lozenge. (fig. 21.)
Drawing · Geometrical drawing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.