www.antik.it/Nautical-antiques/7234-Antique--Sextant/
1646928713Code 7234 Antique SextantEnglish burnished brass sextant early 1900s. Brass frame with engraved goniometric scale, from 0 to + 140, adjustable vernier with reading vernier, wood handle, two colored glasses for the fixed mirror and two for the mobile one, mirror index and horizon. Measure cm 24.5x22.7 h 8 - inches 9.64x8.93 h 3.1
Sextant is an optical instrument used in astronomic navigation for measure the height of a star on the horizon, for obtain geographical co-ordinates about ship. It is circular 60° sector shaped, the sixth part of circumference, that gives name to instrument.
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 7234 Antique Sextant
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