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1513339557Code 4907A Antique Cook octantRare octant signed Cook London made at the end of the eighteenth century; ebony and brass frame, ivory flap, complete with ivory pencil set in the frame above the label with the words. Graduation from -10 ° to + 100 ° , viewfinder with two circular holes. Original mahogany box shaped like the instrument and complete with lock. Perfect condition. Inside the lid on a label you can read: Cook Mathematical Instrument 178 High Street London makers and repairs. Box measures cm 37.5x34.5x10.5.
The octant, the eighth part of circle, is a reflection instrument, conceived about in 1731 by John Hadley (1682-1744) and used to measure on the sea the height of the Sun or of a star in comparison with the horizon. A mobile arm with a mirror fixed on a graduated arc makes possible to obtain by reflection the image of the star laid upon the image of the horizon directly observed. The first examples of these instruments were 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.
5/5
GERHARDUS - 06/18/2018
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Code 4907A Antique Cook octant
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