Rare Equation Table, 1841.
Webster & Son 'Chronometer, Watch, and Clock Manufacturers' 3 Birchin Lane, Cornhill, London. Issued as an 8-page leaflet with printed paper cover, with explanation of the table "To facilitate the Ascertaining the Longitude at Sea and Correction of the Sun-dial," a chart showing phases of the moon for the year, and three pages giving details of Webster's various products including prizewinning box chronometers, compensated duplex watches and sundials. Equation table when opened out 28 x 22 cm.
Very rare. In lovely original condition, as issued, never used.
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