www.antik.it/Nautical-antiques/7384-Octant/
1666177189Code 7384 OctantAntique and rare ebony, brass and marine ivory octant, from the early 19th century. signed Plaskett London, scale from 0 ° to 105 °, complete with two optics and original mahogany box shaped like the instrument with brass hooks and hinges. Very good condition. Box size 33 cm - 13 x 30 inch - 11.8 x 12.5 inch - 4.9 inch. Inside the box there are two labels from two different companies that repaired and sold nautical instruments, one of the manufacturer and restorer of Genoa Doberti Luigi known as Massena, the other of the W. White company of London active since 1790.
Complete with base for display made to measure in wood and brass.
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.
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Nautical antiques
Code 7384 Octant
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