SIB0526 This is newly developed box sextant. Invented in 1803 by instrument maker William Jones

This is newly developed box sextant. Invented in
1803 by instrument maker William Jones. Although
mainly used for terrestrial observation, it was also suitable for
small ships. French sailor Jean Lacombe used a Box Sextant
for his single-handed Atlantic crossing.
The Box Sextant measures 3 inches in diameter and. The Box
Sextant has a brass cover that unthreads and rethreads onto
the opposite side where it functions as a holder. The sextant’s
thickness is only 1 5/8 inches) with the cover installed. When
the cover is removed, the telescope can be extended and the
larger knurled knob can be adjusted to align the images. A
magnifier assists in reading the inclination angle from a
precision German silver vernier scale. The smaller knurled
knob unscrews for use as a tool to adjust the horizon
mirror. The Box Sextant is meticulously crafted and is
shipped with the optics properly aligned.
This beautiful reproduction of the Box Sextant has a single
green moon filter on a swing-arm mount, and is fully
functional, although not intended for navigation.10X10X10