Elements of plane and solid free-hand geometrical drawing, with lettering; and some elements of geometrical ornamental design, including the principals of harmonic angular ratios, etc. In three parts ... for draughtsmen and artisans; and teachers and students of industrial and mechanical drawing
A drawing manual by Samuel Edward Warren, published by John Wiley & Sons in New York in 1878 for draughtsmen, artisans, and teachers of industrial and mechanical drawing. The 73 figures are freehand line diagrams in ink: crossed axes with tick marks, triangles and bisected rectangles, lettered ellipses with dotted construction lines, and interlocking angular patterns useful as geometric motifs or schematic ornament.
