"Graphometer By Duhamel Circa 1760"
Brass graphometer signed "Duhamel à Paris" decorated with a rich decoration of flowers and leaves. The graphometer can be dated to the mid-18th century. In the center of the graphometer, a finely engraved silver compass complete with its original magnetic needle. The semicircle is divided from 0° to 180° and from 180° to 0° degrees. Very fine quality of engraving. The instrument is complete with its ball joint and stand. 
Le Magazine de PROANTIC
TRÉSORS Magazine
Rivista Artiquariato