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Nautical antiques/6610-Antique sextant
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Code 6610
EUR 1500.00
In stock

EUR 1500.00
In stock

used

6610Code 6610 Antique sextantBurnished brass sextant from the early 1900s signed J. Parkes & Sons Liverpool n. 9601, and placed in its original oak wood box, complete with lock with key, hinges, hooks and brass 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 140 °, index and horizon mirror . A label placed inside the lid informs that the instrument was overhauled on 6-7-1945. Box measures cm 27x24.3x13 - inches 10.6x9.5x5.11. Excellent condition and fully functional, complete with custom-made wooden and brass support base.

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 6610 Antique sextant

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