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12 Inch Flat T-Frame Vernier-type sextant Nr. 976, 1790
Jesse Ramsden, London
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One of the exceptionally fine and precise sextants made by the renowned Jesse Ramsden, who greatly improved scale accuracy through the use of his automatic dividing and engraving engine.
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A FINE 12 IN. RADIUS FLAT-FRAME VERNIER SEXTANT BY JESSE RAMSDEN, LONDON, CIRCA 1790
apparently unnumbered, with lacquered-brass 'T'-frame, signed on the arc Ramsden London, the scale divided -4°-130°, Vernier with magnifier, braced index arm, adjustable telescope socket, two telescopes, mirrors, six shades, hardwood handle, contained in original fitted mahogany keystone case
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