The essentials of descriptive geometry
A college textbook on descriptive geometry by F. G. Higbee, published by John Wiley & Sons in New York in 1915 for engineering and drafting students. The 146 line diagrams show orthographic projection problems worked out with points, traces, and revolved arcs: fine solid, dashed, and dash-dot construction lines crossing a horizontal ground line, lettered and primed labels, circles and ellipses tangent to sheaves of straight lines, useful as ready-made technical line art, grid-and-axis motifs, or abstract linear pattern.
