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Octant, 1770
George Adams, London
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Large 17-inch octant in mahogany with a brass index arm, an ivory Vernier scale, and interchangeable shades. Manufactured by George Adams, one of the most important instrument makers of his time in London. The accuracy of angular readings increased steadily with such instruments.
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A FINE 17IN. RADIUS VERNIER OCTANT BY GEORGE ADAMS I, CIRCA 1770 signed and inscribed on maker's plate G. ADAMS Mathl. Inst. Maker to His MAJESTY / Fleet Street London, ivory scale divided to 95º and inscribed James Smallwood to left, Vernier with centralised '0', brass index arm with guard, pin-hole sights, two interchangeable shades, mirrors and brass feet -- 18¾ x 16½in. (47.5 x 42cm.) overall
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