Elements of geometry and trigonometry
A school textbook of plane and solid geometry and trigonometry by Charles Davies, issued by A. S. Barnes in New York and Chicago in 1886 for American students. The 200 figures are small line diagrams — circles with inscribed triangles and hexagons, tangents, chords, solids and arcs — drawn in plain black rule with letter labels at each vertex, useful as geometric motifs and instructional marks.
