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  Andrew Ross Microscope

  The brass microscope stands on a splayed Y-shape base and engraved with "Andw. Ross, London, No.190." This instrument represents the classic design created by Ross - the bar-limb and splayed Y-shape base - which was copied by many other manufacturers. The monocular instrument's limb is triangular in the cross section. The dual side pillars end in trunnion joints that allow for inclination. The square mechanical stage has an uppermost section which rotates clockwise and counter-clockwise. The stage can be adjusted along the X and Y axis with a rack and pinion mechanism. The stage also has a bullseye condenser and stage forceps attachments which are attached by a pin. The stage has a substage iris diaphragm which can be rotated. The receiver for the threaded objective is spring loaded, which in effect acts as a "safety-stage." Coarse focusing is achieved by a rack and pinion mechanism which is controlled by thumbscrew located at the side of the stage. Fine focusing works by a lever mechanism mounted within the bar proper and adjusted by a knurled thumbscrew mounted on the bar. The instrument has a substage plano-concave substage which is mounted in a gimbal. The microscope also comes with a stand-alone bullseye condenser with a circular stand. The mahogany glass-fronted case contains three internal accessory drawers.