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EUR 2000.00
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6613Code 6613 Antique sextantBurnished brass sextant from the second half of the 19th century signed Frodsham & Keep Liverpool active in 17 South Castle street, Liverpool between 1856-1878 and placed in its beautiful original mahogany wooden box, complete with key lock, hinges, brass hooks and handle. Flap and vernier made of silver, mahogany handle, 3 colored glasses for the fixed mirror and 4 for the movable one, three telescopes, filter, a microscope for reading the vernier, graduated from or to 150 °, pin key for adjustments, mirror of index and horizon. On the outer cover of the box an engraved brass label has the following inscription: H.M.S "CONWAY" The Trinity House Prize presented to C.W.W. HILL July 1921. Box 30x28.5 h 13.4 cm. Excellent condition and fully functional, complete with made-to-measure wooden and brass base.

HMS Conway was a training ship used for naval training. The school was founded in Liverpool in 1857, at the request of the shipowners following the need to have a high level of reliability of the officers of the merchant navy.
The origins of Trinity House go back to a sea rescue corporation, established by Archbishop Stephen Langton in the 12th century. The first documentary trace of this guild was a Royal Decree of 1514 of Henry VIII of England in which a brotherhood of seamen called the Guild of the Holy Trinity was recognized. The guild initially owned a dormitory and lounge near the Deptford shipyards on the south bank of the Thames. The Seamarks Act of 1566 attributed responsibility to the Corporation to install alerts and navigational aids. In 1604 James I of England granted Trinity House the rights to pilot maritime traffic and the exclusive right to issue pilot licenses for the Thames, London and 40 other districts, until 1987 when, with the Pilotage Act, responsibility for ship traffic in the districts passed to the respective port authorities. In 1609 the first lighthouse built by Trinity House was completed, in Lowestoft, County Suffolk. In 1732 the Trinity House moored the first lighthouse ship in the world at the mouth of the Thames, to signal the presence of a sandbank known as Nore Sands to the boats. In 1965, a retirement and care home for sailors and employees of the guild was built in Walmer, Kent, entirely financed by the Trinity House. Since 1997 Trinity House has provided commercial, monitoring, hydrography and technical support services for offshore operations.

In order to measure a height of a star (for example, the Sun), you have to set the instrument in a vertical plane and, looking through the sight device, to mark out the line of the horizon visible through the non-silvered half of the fixed mirror. Moving the alidade that is together with this mirror, make sure that the light rays coming from the star, and then reflected by the mobile mirror and by the silver half of the fixed mirror, be directed from the fixed mirror to the observer: if you look through the sight device, you see the image of the star, obtained for double reflection, coinciding with the line of the horizon. The height of the star is expressed by the angle whose value is read on the graduated scale. The filter is used when the star is the Sun.

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Code 6613 Antique sextant

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