Perspective drawing instrument
1820-1829
Diagraphe perspectograph, in fitted mahogany case
Ronald's perspectograph, in mahogany case
Ronald's patent perspectograph, in red leather bound case
"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 instruments
1820-1829
Perspective drawing instrument
1820-1829
Perspective drawing instrument
1820-1829