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Ronald's patent perspectograph, in red leather bound case

Diagraphe perspectograph, in fitted mahogany case

Perspective machine by James Watt

"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

1820-1829

Ronald's perspectograph, in mahogany case

One of three perspective drawing instrument by Jecker Freres, Paris, in brass; in felt-lined mahogany box

Perspective drawing instrument

1820-1829
One of three perspective drawing instrument in wood in felt-lined mahogany box.

Perspective drawing instrument

1820-1829
Selection of three perspective drawing instrument by Jecker Freres, Paris, in brass, one the same size as first and one larger, in wood; each in felt-lined mahogany box.

Perspective drawing instruments

1820-1829