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Here is our selection of Antique sextants. The primary use of a sextant is to determine the angle between an astronomical object and the horizon for the purposes of celestial navigation. The determination of this angle, the altitude, is known as sighting (or shooting) the object, or taking a sight. The angle, and the time when it was measured, can be used to calculate a position line on a nautical or aeronautical chart. Common uses of the sextant include sighting the sun at solar noon or Polaris at night (in the Northern Hemisphere) to determine latitude. A sextant can also be used to measure the lunar distance between the moon and another celestial object (such as a star or planet) in order to determine Greenwich Mean Time and hence longitude.


Antique Ladder Frame Sextant,
signed Potter Tower Hill & Poultry London.
Complete with Pinhole Sighting Tube, Errecting Telescope,  Long Inverting Scope with Two Eyepiece's, Cross Hairs Intact, Filter Cap,  Adjusting Pin & Ebony Handle.
In Original Dovetailed Mahogany Box with Henry Hughes Trade Label.
Silver Scale & Vernier, Scale Very Crisp,
Box 27x25x13 cm

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Antique ladder frame sextant. 
Engraved Crichton, London, with gold lacquer.
Also engraved with the owners name W.Benson-Coode 1871.
In original fitted mahogany case with four telescopes. SOLD

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Antique "bell frame" sextant.
Engraved Heath and Co, New Eltham, London,
Made for J.Grant & Son, Leith.
In original fitted mahogany case with three telescopes 

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Antique "three ring" sextant.
Engraved Heath & Co, New Eltham, London.
In original fitted mahogany and bakelite case with two telescopes.
price £359.00

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