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Code 7370
EUR 1800.00
In stock

EUR 1800.00
In stock

used

1658937193Code 7370 Antique Sextant1900s Brass sextant signed H. Hughes & Son Ltd, a company active for about 250 years and specialized in the production of nautical instruments; instrument complete with optics and placed in an elegant original square wood box with closing hooks and brass handle. Brass frame with engraved goniometric scale embedded in the arch, with scale from 0 to + 160°, vernier with micrometric screw adjustment and vernier reading, wood handle, index and horizon mirror. A label placed inside the lid of the box indicates that the instrument was overhauled in 1940. Box 34x30 h 16,5. cm - 13.3x11.8 x6.5 inches. Good condition and fully functional and complete with base for support made of wood and brass on measure.

The firm established by Henry Hughes in the 1830s became H. Hughes & Son in 1875, and H. Hughes & Son, Ltd. in 1903. After the merger in 1947 with Kelvin, Bottomley & Baird, Ltd., it became Kelvin & Hughes, Ltd.

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 7370 Antique Sextant

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