Essentials of drafting; a text and problem book for apprentice, trade and evening technical schools
A 1918 mechanical drawing textbook by Carl L. Svensen, published by D. Van Nostrand in New York for apprentices and students in trade and evening technical schools. The plates are line diagrams of machine parts in orthographic projection, with dashed hidden edges, centerlines, dimension arrows and hatched sections, plus lettered construction layouts useful as precise technical linework and geometric ornament.
