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Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
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Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
Nautical antiques/4237-Ebony octant
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Nautical antiques/4237-Gift box

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2662014142920734Code 4237 Ebony octantRare ebony antique octant, bone and brass, signed Hennessy Swansea. Scale from 0° to 105°, brass sight with two holes, with original mahogany box. Very good condition and in order. Measures of box cm 33x27 - inches 12.99x10.62.

The octant, the eighth part of circle, is a reflection instrument, conceived about in 1731 by John Hadley (1682-1744) and used for measure on the sea the height of the Sun or of a star in comparison with horizon. A mobile arm with a mirror and fixed on a graduated arc makes possible to obtain by reflection the image of the star laid upon the image of horizon directly observed. First instruments was made using valuable wood, ebony or mahogany, and they had ivory gradation; then they were replaced by brass or bronze instruments, and the gradations were engraved on a silver strip, fixed in the metallic arch of border.

About antique nautical instruments, compass is the best known; but we have to remind some other instruments useful for all discoveries during the centuries, as sextants, for calculate longitude, or barometers as well, for weather-forecast.

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Code 4237 Ebony octant

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