Late 18th century French marine octant Navy Depot Lorieux Paris case

Rare French marine octant – late 18th/early 19th century
French Navy Depot – Maison Lorieux, Paris
Antique French marine octant, an astronomical navigation instrument used to determine latitude at sea, predating the widespread use of the sextant.
This example is an official instrument of the Navy Depot, numbered 106, intended for professional maritime use and controlled by the French naval administration.
The Lorieux company is renowned for manufacturing high-precision nautical instruments for the French Navy.
Estimated date:
Late 18th century – early 19th century (circa 1790–1830)
Description:
Marine octant (1/8 circle)
Ebony wood frame
Brass mechanical parts
Graduated bone limb
Turned wood handle
Fine adjustment mechanism
Solar and optical filters included
Dimensions of closed case: 13.4 inches x 11.8 inches x 4.7 inches
Total weight: 7.3 pounds
Case and accessories – complete set
Original wooden case containing:
The octant
Interchangeable sighting glasses
Colored filters
Original screwdriver with wooden handle
Original interior fittings
Extremely complete set, rare to find in this condition.
Condition:
Very good overall condition for an instrument over 200 years old
Wear consistent with age
No structural elements missing
Solid, authentic antique case
Protected shipping with tracking.