A Cary/Gould-type lacquered brass portable compound microscope, unsigned, circa 1840 The part-tapered tube screw-fitting at the objective end into a threaded collar positioned at the top of a square section upright cut with teeth for the rack and pinion up/down adjustment of the stage, the platform fitted with sprung brass object retaining plate complete with tool post holes to leading edge, with pivoted plano-concave mirror applied to the cylindrical base section beneath, the whole mounted via a threaded recessed collar into the lid of the original mahogany box containing accessories including five objective lenses, forceps, specimen holder, and substage condenser lens, the case 16cm (6.25ins) wide. The design of the current lot was devised during the early 1820's by William Cary (1759-1825) and was subsequently published by his former apprentice, Charles Gould, in his 1827 publication THE COMPANION TO THE MICROSOPE . An almost identical instrument was sold in these rooms on 15th September 2015 (lot 9) for £420 hammer.