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Nautical antiques/6609-Gift box

EUR 1800.00
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1590759199Code 6609 Antique sextantBrass sextant signed Heath & C. Crayford London of the late 19th century, complete with lensens and placed in its beautiful original oak box, complete with original key, with hooks, handle and brass lock. Flap and vernier made of silver, mahogany wood handle, 3 colored glasses for the fixed mirror and 4 for the mobile one, four telescopes, magnifying glass, a microscope for reading the vernier, graduated from 0° to 150 °, mirror of index and horizon. Revised in May 1911. In perfect working order. Very good condition. Complete with wood and brass base for support made to measure. Box 28.5x26 cm h 13.

The Heath & C manufacturer of scientific instruments was founded in 1845 by George Heath; his son George began his apprenticeship in the company in 1863 and in 1872 became owner of the company. In 1882, two distinct factories were built in Crayford and New Eltham to cope with the significant increase in requests for instruments. In 1937 the company was incorporated by Stanley.

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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