"Diagraphe", perspectograph for drawing from nature in perspective or orthogonal projection 1880-1910
Diagraphe, perspective instrument for drawing from nature or orthogonal projection drawings 1890-1910
Perspective drawing instrument on wooden base, invented by the late Hugh Cecil Robinson and made under his supervision by Stanley, Great Turnstile, London, with 6 working drawings and 3 tracings relating to instrument Perspective drawing instrument on wooden base 1880-1910