(detail)


226 226. AN EARLY 19TH-CENTURY FRENCH BRASS PERSPECTIVE SQUARE


unsigned, divided over one side and inscribed Réduction des longueurs en Pente -- 5¼in. (13.3cm.) diameter


Literature: Dawes, H: Instruments of the Imagination, The Dawes Trust, 2009, p.94 fig.126. £150-250


227.


AN 18TH-CENTURY CIRCULAR BRASS PROTRACTOR BY JESSE RAMSDEN, LONDON signed on the cross bar Ramsden London -- 6in. (15.2cm.) diameter £200-300


228.


AN 18th-CENTURY BOXWOOD ALCOHOL PROOF SLIDE RULE BY T. GILL, LONDON


calibrated over both sides, signed and stamped T. Gill / PROOF -- 8¾in. (22cm.) diameter (closed)


This slide rule is Thomas Gill’s version of the proofing rule invented by John Dicas (London, w.1774-1797) for use with his hydrometer. Dicas was awarded a patent (no. 1259) for his hydrometer used with a sliding rule in 1780. Essentially it functions as a sliding chart that can be adjusted for the difference in density of the liquor according to its temperature.


£100-150 229.


A 20TH-CENTURY MARINE BULKHEAD INCLINOMETER BY H. HUGHES & SON LTD, LONDON


with 3¾in. diameter silvered dial signed and inscribed as per title, scale divided 40°-0°-40°, lacquered-brass indicator with split oxidised-brass recorder arms, the left a friction arm with return knob through bevelled glass face plate, contained in a brass case for bulkhead mounting -- 6½in. (16.5cm.) diameter overall


£100-150 230. A CHRONOMETER GUARD BOX


hinged mahogany with securing hook and partial leather strap, the interior with green baize padded lining to receive a 5in. square chronometer, approximately -- 8in. (20cm.) square


£80-120 229 227


228 additional images online at www.charlesmillerltd.com 85


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