Brass graphometer signed Dubois aux Génies
Paris, France
18th century
Brass, glass
Width: 23.5 cm
Height with ball joint: 4.8 cm

A semicircle made of openwork brass and featuring two scales from zero to one hundred and eighty degrees, as well as two sighting pins.
Engraved decoration of leafy scrolls and flowers.
The compass has a base engraved with a four-way compass rose as well as four additional directions, and a fleur-de-lis.
Directional information is also engraved in full.
Blued needle.
Engraved perimeter with graduations from zero to three hundred and sixty degrees.
A rotating arm is fixed to the main plate; it is equipped with two sighting pins. Engraved next.
The plate is fixed on a ball joint embedded on its support tube with its brass wing screw.
Marked "Dubois aux Génies Paris".

Ref.: 4992

Text and photos © FCP CORIDON