Orthographic and isometrical projection : development of surfaces and penetration of solids
A technical drawing manual by Ellis A. Davidson, published in London by Cassell, Petter, and Galpin in 1868, written to teach engineering and mechanical draughtsmen orthographic and isometric projection. Its numbered plates show wireframe solids, sectioned prisms and pyramids, and flat development layouts drawn with dashed projection lines and hatched cut faces.
