Browsing by Author "Ross, Andrew."
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Item 1.024(2012-02-07) Ross, Andrew.This compound monocular microscope is the earliest Ross instrument in the collection, and may be one of the four known to have survived. The limb, which supports the body-tube and stage, is attached to the pillar by a ball-and-socket joint. The stage carries a tubular column on its under surface, and the pillar sits on a flat tripod base. About 1835. Signed: Ross, London.Item 1.025(2012-02-07) Ross, Andrew.The popular model features the Y-shaped, flat tripod base which became a characteristic of many Ross microscopes. The vertical flat pillars hold the limb by means of trunnions, and a bar attached to the top of the limb supports the optical tube, with a lever for fine focusing. The stage and the mirror are attached to the limb. This instrument is similar to the one described in the Frontispiece of John Quekett's Practical Treatise on the Use of the Microscope (1848). It comes with a wooden carrying case. Signed: A. Ross, London 563.Item 1.026(2012-03-05) Ross, Andrew.Very similar to Ross microscope described above, except that it is larger and has a more elaborate stage and condenser fittings. It comes with a carrying case, eye pieces, and one objective lens, with engraving "A. Ross, 1852." Signed: A. Ross London 529.Item 1.027(2012-03-05) Ross, Andrew.The binocular compound microscope has a heavy brass casting that serves as a Y-shaped base and vertical flat pillars. The standard large circular stage is attached to the limb, which is carried on a trunnion. It comes with a wooden carrying case and accessories (eyepieces, objective cases, bull's eye condenser). Signed: Ross, London. 4046.Item 1.028(2012-02-07) Ross, Andrew.This binocular compound microscope is very similar to the above instrument (Ross 4046), except for its rotating stage. Also referred to as the Ross-Zentmayer microscope, it incorporates a swinging stage, a feature patented by Joseph Zentmayer (1826-1888), a German-born American instrument maker. The stage can be turned on its horizontal axis. It sits on a wooden platform and comes with a wooden carrying case and accessories. Signed: Ross, London. 5062.Item 1.029(2012-02-07) Ross, Andrew.The 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.Item 1.030(2012-02-07) Ross, Andrew.The binocular compound microscope is a variation on the Ross- Zentmayer instrument described above (Ross 5062). It features an A-shaped, tripod foot which supports the double pillars. The limb, attached to the pillars by trunnions, carries the rest of the parts of the microscope, with a rotating stage. It comes with a wooden case and accessories. Signed: Ross-5277. LondonItem 1.031(2012-02-07) Ross, Andrew.This model was designed by Francis Herbert Wenham (1824-1908) at a time when interest in oblique illumination was high. It was called "Wenham's Universal Inclining and Rotating Microscope." The main components are of standard Ross design but the large segmental limb, which carries the monocular body, the stage, and substage, slides in a fitting attached to the circular rotating base. This was an expensive and complex instrument to build, and as a result very few of them were made. No case or accessories. Signed: Ross, 5250 London.Item 1.050(2012-02-07) Ross, Andrew.The latest Ross microscope in the collection displays the square horseshoe base, typical of late-19th-century design found in German microscopes. The square pillars hold the trunnions to which the square stage is attached. The tubular limb, with an angular arm, supports the body-tube which has a triple nosepiece. The swinging substage consists of an Abbe condenser and an iris diaphragm, and a rotating mirror is attached to the tailpiece. Signed: Ross London 8635.