5 Inch sextant Nr. 746, 1783
Jesse Ramsden, London
Maker:
Collectie:
NavigArte
Een van de zeer fijne en nauwkeurige sextanten van de befaamde Jesse Ramsden
die met een automatisch graveer- en verdeelmachine de nauwkeurigheid van de schaal enorm kon verbeterde.
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'