"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
Ronald's patent perspectograph, in red leather bound case
Ronald's perspectograph, in mahogany case
Perspective drawing instruments
1820-1829
Perspective drawing instrument on wooden base
1880-1910
Perspective drawing instrument on wooden base
1880-1910