


Diagraphe perspectograph, in fitted mahogany case

Diagraphe, perspective instrument for drawing from nature or orthogonal projection drawings
1890-1910

Perspective drawing instrument
1820-1829

"Diagraphe", perspectograph for drawing from nature in perspective or orthogonal projection
1880-1910

Ronald's patent perspectograph, in red leather bound case

Ronald's perspectograph, in mahogany case
Perspective drawing instrument
1820-1829
Perspective drawing instrument
1820-1829
Perspective drawing instruments
1820-1829