拍品專文
A rare survival of Ramsden's bridge frame, made by the last of his successors.
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WORTHINGTON & ALLAN, EARLY 19TH CENTURY
細節
A BRIDGE-FRAME SEXTANT
Worthington & Allan, early 19th century
signed on the arc of 8½-inch radius Worthington & Allan, London, the silver scale divided 0-130° with vernier and magnifier, 7 shades, in fitted mahogany case with four telescopes and rotating shade eyepiece.
11½in. (29cm.) long in case
Worthington & Allan, early 19th century
signed on the arc of 8½-inch radius Worthington & Allan, London, the silver scale divided 0-130° with vernier and magnifier, 7 shades, in fitted mahogany case with four telescopes and rotating shade eyepiece.
11½in. (29cm.) long in case