A treatise on special or elementary geometry
Edward Olney's 1877 geometry and trigonometry textbook, published by Sheldon in New York for American college and high-school students. The 201 figures are line diagrams printed on tanned paper: circles with inscribed polygons, labelled triangles, dashed construction arcs, compass crossmarks and lettered vertices, useful as ready-made geometric linework, scientific-diagram texture, or lettering keyed to points.
