216 (detail)


216 216. A RARE 5IN. RADIUS MINIATURE BRASS VERNIER SEXTANT BY JESSE RAMSDEN, LONDON, NO. 746, CIRCA 1783-4


with polished-brass one-piece frame, signed on the cross bar Ramsden London and numbered on the back of the index arm ‘746’, sloping arc with scale divided to 130°, Vernier scale with right-aligned ‘0’, fine-screw adjustment with magnifier, back-lever horizon mirror adjustment, quick-release threaded telescope socket, mirrors, shades, telescopes and threaded ebony handle, contained in a fitted keystone box with accessories and trade label for ‘Ewer & Sons, Cardiff’ -- 7 x 7½in. (17.8 x 19cm.)


£2500-3500


217. A 10IN. RADIUS LACQUERED-BRASS VERNIER SEXTANT BY JESSE RAMSDEN, LONDON, NO. 1093 CIRCA 1791


signed on the arc Ramsden London and numbered behind apex ‘1093’, scale divided to 135°, adjustable telescope socket, seven shades, index and horizon mirrors, rosewood handle -- 12½ x 12½in. (31.7 x 31.7cm.) £2500-4000


217 (detail)


217 80 additional images online at www.charlesmillerltd.com


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