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Code 7006
EUR 1800.00
In stock

EUR 1800.00
In stock

used

1626439365Code 7006 Antique sextantBurnished brass sextant signed HEATH & C Ltd New Heltham London SE9, manufacturer of scientific instruments founded in 1845 and active until 1937. HEZZANITH Endless Tangent Screw Autometic Clamp Patent model from the early 1900s, complete with lenses and placed in the its beautiful original box of mahogany wood complete with hinges, closing hooks and brass handle. Flap and vernier of silver, handle of ebony, 3 colored glasses for the fixed mirror and 4 for the mobile one, three telescopes, one of which is long, key for registration, vernier graduated from 0 to 150 °, index and mirror horizon. A label placed inside the lid informs that the instrument was overhauled on 1 January 1932. Box cm 28x26.5 h 14 - inches 11x10.43 h 5.5. Excellent condition, fully functional and complete with base for support made of wood and brass on measure.

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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