Descriptive geometry
A 1918 descriptive geometry textbook by Ervin Kenison and Harry Cyrus Bradley, published by Macmillan in New York for engineering and drafting students. The 243 figures are line diagrams of projection problems: heavy and light black rules, long dashed projector lines, arcs of revolution, and small letter-and-superscript labels (A\u02b0, B\u1d5b, HQ, VQ) arranged around a horizontal ground line, useful as sparse geometric linework and technical annotation.
