Rare "William Jones" Miniature Solid Brass Box Sextant. 3-Inch diameter. Very innovative & collectible instrument

The exquisite intricacy of this box sextant, invented by William Jones in 1803; a mathematical instrument maker, is impressive. Contained within a neat brass cylinder are a coloured filter shade and a miniature telescope. A sturdy brass casing protects the delicate parts.

It was first used for terrestial survey measurements but soon turned out to be a great sextant for smaller ships. It is said that French sailor Jean Lancombe crossed the Atlantic single-handedly using a box sextant.

Depth 1.5" (40mm), width 3" (78mm). Marked "London, 1911".. An absolutely essential unit for every sailing class and nautical enthusiasts! This works just like a regular sextant in that the measurements required are the same and it has all the mirrors, telescope, gauges of a regular sextant. I can also send in a FAQ of general instructions on how to use a sextant with this unit.

Amazingly accurate and unusual sextant that will give your GPS a run for its money. Only 400 made specially for serious collectors and yachtsmen...