www.antik.it/Nautical-antiques/7364-Antique-Sextant/
1658936624Code 7364 Antique SextantBrass sextant signed Ainsley South Shields (1858-1886)complete with original wood case and lenses. Silver vernier, wood handle, 3 colored glasses for the fixed mirror and 4 for the mobile one, two telescopes, a microscope for reading the vernier, graduated from 0° at 130 °, index mirror and horizon mirror.
Second half of the XIX century.
Very good condition. complete with base for support made of wood and brass on measure.
The sextant is an ancient astronomical instrument used to measure the height of a celestial body (for example the Sun): the sextant is placed in a vertical plane and, looking through the aiming device, the visible horizon line is sighted through the non-silver half of the fixed mirror. By moving the alidade, with which the mirror is integral, the light rays coming from the star and subsequently reflected by the moving mirror and by the silver half of the fixed mirror are returned by the latter in the direction of observation: if if you look through the sighting device you see the image of the star, obtained by double reflection, coinciding with the horizon line. 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 to be sighted is the Sun.
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Nautical antiques
Code 7364 Antique Sextant
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