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This is a solar microscope, with a square base and attached rectangular mirror. It comes with accessories and a wooden case. About 1795. Signed: W&S, Jones Fecerunt. 135 Holborn, London.

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This all brass monocular microscope has a bent claw foot, a feature found in James Swift & Son instruments. The stage, attached to the base by trunnions, supports the tubular limb with an arm. The coarse focusing is by the draw-tube, and the fine focusing by the screw on top of the limb. A swinging mirror is attached to the tubular tailpiece. The small instrument was likely intended for use by students. No carrying case and accessories. About1880. Signed: Bryson, Edinburgh.

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Built to the popular Ross design, the microscope displays the typical Y-shaped foot, vertical pillars, boxy limb with a tubular tailpiece, the body-tube with a transverse arm that attaches to the limb. It comes with monocular as well as an interchangeable binocular body, with an adjustment mechanism by rackwork (with a single knob) in the front. It sits on a wooden platform. No case or accessories are included. About 1870. Signed: Baker. 244. High Holborn, London.

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The dissecting microscope has a large brass stage with hand rests (covered with leather). It is mounted on a pair of straight legs and a curved foot in the back. The binocular body is attached to the limb by an arm, with the nosepiece extending downward. Also referred to as the Stephenson dissecting microscope (invented by John Ware Stephenson in 1872), the binocular instrument provides an erect image and makes dissection easier. It comes with a carrying case and accessories. About 1890. Signed: Swift & Son 81 Tottenham CTRD London. W.C.

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This is the firm's "Challenge" microscope, with a dark brass, claw foot. It differs from the Ross model microscopes Swift made earlier. Instead of the vertical pillars that supported the limb, the curved foot holds the limb on trunnions. The Wenham binocular body moves on the rack and pinion and has an ocular adjustment mechanism (with a single knob) on the back. It comes with a wooden carrying case and accessories. About 1880. Signed: Swift & Son 43, University Street. London. W.C.

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This instrument has all the features of a late 19th-century Continental microscope. A short rectangular pillar sits on a horseshoe base and supports the limb and the stage on trunnions. The body-tube has a rackwork for coarse focusing and carries a triple nosepiece. Fine focusing is by the micrometer screw on the top of the limb. The substage, consisting of an Abbe condenser and iris diaphragm (which itself moves horizontally by rackwork), can be raised or lowered by means of rackwork. The double mirror is attached to the end of the substage mechanism. This microscope was purchased by Dr. William Keiller (1861-1931) in Edinburgh, Scotland, prior to his appointment in 1891 as the first Professor of Anatomy at the University of Texas Medical Branch at Galveston. It comes with wooden carrying case. About 1890. Signed: E. Leitz Wetzlar no 17327.

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Essay on light microscope – stinurcranaponciocreanocessibi

The unsigned Culpeper-type microscope has two sets of brass tripod that support the stage and the body-tube. The swinging mirror is attached to the wooden base. The instrument also has the rack-and-pinion system on the outer tube, a feature that was later added to Culpeper-type microscopes. No accessories. About 1800.

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This early instrument, with a horseshoe-shaped base, has a brass body-tube that moves on the rackwork and is attached to the limb by a short arm. The pillar supports the stage and the limb. The instrument is also fitted with an Abbe condenser and an iris diaphragm, features which were added later on. Based on the style and the low serial number, however, we believe that the microscope dates from about 1860. No carrying case or accessories. Signed on the tube: Oberhaeuser, Place Dauphine, Paris. Stamped on the bottom of the base: 2247.