The teaching of geometry
A 1911 teacher-training manual by David Eugene Smith, published by Ginn and Company in Boston and New York for instructors of school geometry. The figures are plain line diagrams—lettered triangles, arcs and construction lines in dashes, lunes, a roof truss with plumb line—printed black on tan paper, usable as spare geometric marks, dashed-arc textures, or diagram-style page ornament.
