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1876 Bausch & Lomb

One of the first microscope models ever made by the Bausch & Lomb Company under the brief design era of Ernst Gundlach. This early version features the screw thread focus control on the nose end of the barrel, which was discontinued in 1878 in favor of a draw tube, as well as a rack and pinion model. The microscope stands 15 " tall. It has a 5/16" thick glass stage with a center hole. The condenser is a wheel of stops. The mirror and condenser arm swing to the side for oblique illumination. The plano-concave mirror is excellent and is mounted in a vulcanite ring. The Bausch & Lomb Company discovered and used vulcanite for eyeglass frames during and after the American Civil War. Vulcanite is used on the eyepiece, the lens, for the entire condenser assembly, and the mirror as noted. The instrument is finished in lacquered brass with a painted black base. The over all finish is excellent with one patch of varnish about the size of a quarter removed from the base of the barrel near the nosepiece. The lens is a very low power blackened brass objective with a diaphragm that screws onto the front. The patented fine focus control is achieved when a micrometer screw that causes the barrel to move up and down against two pieces of spring steel, which also attach the barrel to the limb. While unique, the design is delicate and prone to breaking. This instrument has its bottom spring replaced.  The microscope is signed in ornate script on the side plate, "Bausch & Lomb Optical Company, Rochester NY". On the other side plate, is engraved: "Patented Oct. 3, 1876". The number "2" appears on the limb and under the stage on the mirror assembly. A script "P" is on the bottom of the limb, and a similar script "B" is on the bottom of the base. This is a unique and important instrument in the history of the American microscope industry.

Item 1063

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