A German lacquered and patinated brass compound monocular jug handle microscope Carl Zeiss, Jena, early 20th century The tube with rack and pinion coarse and fine screw focus adjustment and stamped with trademark CARL ZEISS, JENA, Nr. 73114 to front above quadruple nosepiece, the circular stage fitted with X and Y screw adjusting Vernier slide clips onto a rotating table, the underside with sub-stage condenser and pivoted plano-concave mirror, the jug handle limb pivoted via axis support behind the stage, on U shaped foot, in original mahogany box with additional objective lens canisters and two eyepiece lenses, the box 38cm (15ins) high. Provenance: The Maurice Gillet collection of microscopy, inventory ref. G2563. Carl Zeiss set up business in Jena, Thuringen, Germany in 1846. In 1866 he went into partnership with Ernst Abbe whose theories brought significant improvement to microscope design. Throughout the second half of the 19th century the business expanded rapidly to become one of the largest manufacturers of optical instruments in Europe with agents and outlets based throughout the globe. The business still operates today however was completely re-structured after WWII. Zeiss microscopes have always highly regarded for the quality of the optics and their ability to keep abreast of innovation in the field of microscopy.