Additions c. 1741. Astronomical quadrant with fixed and moveable telescopic sights. Screw clamp on moveable sight. Tripod socket with ball and socket joint tightened by engraved winged screw. Milled screw to lock socket to tripod staff. Limb divided by LeBas 2-0-95° every 10'.
Materiaal
"Diuisé Par LeBas" along limb. "Le Maire fils/ A Paris" on micrometer.
