Descriptive geometry for students in engineering science and architecture; a carefully graded course of instruction
A 1915 textbook of descriptive geometry by Henry F. Armstrong, published by John Wiley & Sons in New York for engineering, science, and architecture students. The plates are line diagrams: ground lines lettered X–Y, projected points labelled a, b, c with primes, dashed construction lines, arcs, angle marks, and shaded traces useful as technical-drawing texture or geometric motifs.
