antik.it/Nautical-antiques/6538A-Antique-sextant/
1580732450Code 6538A Antique sextantBurnished brass sextant signed Potter Poultry London made in the middle of the 19th century, complete with original mahogany box shaped like the instrument, brass hinges and hooks. Flap and vernier made of silver, wooden handle, 3 colored glasses for the fixed mirror and 4 for the movable one, a telescope, a microscope for reading the vernier graduated from or to 150 °, index and horizon mirror. Complete with some accessories. A cartouche on the back of the lid informs that the instrument was revised in 1901. Very good conditions. Box cm 35x29 h 12.85 - inches 13.77x11.41 h 5.
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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Italy: delivering on the average in 24 h.
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Other countries: delivering on the average in 5 weekdays; custom duties charged to the buyer.
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Nautical antiques
Code 6538A Antique sextant
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