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7 1/2 in. Ebony Octant by J. Sewill

Auction:
2502
Lot:
518
Sold for:
$533$450

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Auction:
Clocks, Watches & Scientific Instruments - 2502
Location:
Marlborough
Date / Time :
May 01, 2010 10:00AM

Description:

7 1/2 in. Ebony Octant by J. Sewill, Liverpool, the instrument with bone maker's plaque marked J. Sewill, 61 South Castle Street, Liverpool, inlaid scale calibrated 0-135 with vernier and microscope on a 3 1/4 in. limb, sun and horizon shades, sighting scope attachments and keystone shaped walnut carrying case.
Estimate $600-800

Instrument has had exensive exposure to salt air and brass elements have surface corrosian.

Keywords

Ebony Octant, Brass instrument, Calibration, Celestial navigation, Measuring instruments, Octant