Brass ball-jointed graphometer with pinnules and compass.
Signed.
Length: 22.2 cm.
Scratches and minor wear.
In a walnut case, numbered 203 and 409 (stains, scratches and dents; slightly off-set lid).
Claude François BERTHIOT (1819-1860), mechanical optician, active between 1844 and 1860, at 48 quai des Célestins, Lyon.
His widow, Marie GRENIER, continued in business until 1862.
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