236


237


236.


AN EARLY 19TH-CENTURY 5IN. VERNIER REFLECTING CIRCLE BY LISTOR & MARTINS, BERLIN


with oxidised-brass frame, polished-brass meridian signed as per title, with inset silvered scale, lacquered-brass index arms, vernier magnifier, five shades, two mirrors and sighting tube, double rosewood handle, contained within original fitted wooden box, with accessories. Case -- 12¼ x 12¾in. (31 x 32.5cm.)


£700-900


237. A LATE 18TH-CENTURY 13½IN. RADIUS VERNIER OCTANT BY DOLLOND, LONDON


the ‘T’-frame with ivory scale divided to 100º, index arm signed as per title, pencil top, pin-hole sights, interchangeable shades, index and horizon mirrors, brass feet to reverse, overall -- 15in. (38cm.) high


£500-800 238.


AN UNUSUAL EARLY 19TH-CENTURY LACQUERED-BRASS DRUM SEXTANT BY W.& T. GILBERT, LONDON


signed as per title, inset silvered scale divided to 145º, vernier with external slot and clamp with fine adjustment over, magnifier, internal pin-hole sighting and shades and threaded cover -- 3in. (7.7cm.) diameter


William and Thomas Gilbert worked from 148 Leadenhall St between 1819-1831.


£400-600 additional images online at www.charlesmillerltd.com 69 238


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