Product Details
A 19TH CENTURY 'T-FRAME' BRASS FRAME SEXTANT BY R.H. COGSWELL (HALIFAX. N.S.) lower arc signed 'R.H. COGSWELL HALIFAX N.S.', brass frame, ebony handle, ivory vernier scale, swing arm magnifier, two sets of coloured sun shades (three for index mirror, three for horizon mirror) both mirrors with damage, in a damaged mahogany case with F.W. Lincoln Jr. & Co. trade label, sighting tubes and adjustment pick, with hand-written instructions; together with a book 'Longitude - The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time' by Dava Sobel, detailing a brief history of astronomy, navigation and horology and the central place of John Harrison, a self taught Yorkshire clockmaker and his forty year obsession with building the perfect timekeeper
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Estimate £200-300