2012-02-072012-02-07About 18752012-02-07http://hdl.handle.net/2152.3/427The model is similar to an aquarium microscope advertised in the company's 1875 catalog. The flat tripod foot allows the instrument to be placed close to a tank. The square pillar has a rack-and-pinion mechanism by which the horizontal arm moves vertically. The binocular tube is attached to the end of the arm and moves horizontally by another rack-and-pinion mechanism. It has a wooden carrying case. Signed: Ross, London 4017.enBiologyBritish FirmsMicroscopyOptics