Bausch & Lomb Optical. Co., Rochester NY, #643

The Research Model microscope, c. 1878

Bausch & Lomb Optical. Co., Rochester NY.#643, The Reseach model microscope, c. 1878

Bausch & Lomb Optical. Co., Rochester NY.#643, The Reseach model microscope, c. 1878

Bausch & Lomb Optical. Co., Rochester NY.#643, The Reseach model microscope, c. 1878

Bausch & Lomb Optical. Co., Rochester NY.#643, The Reseach model microscope, c. 1878

Bausch & Lomb Optical. Co., Rochester NY.#643, The Reseach model microscope, c. 1878. Accessories

The microscope is furnished with two B&L objectives marked 1/4-inch and 1-inch each with brass canister, two eyepieces, two stage clips, an Abbe condenser, an aperture stop that covers the front lens of the condenser, a substage polarizing Nicol prism in a rotating mount, an analyzing Nicol prism that mounts above the objective, a vertical illuminator, and a double objective changer. The serial number, 643, is stamped into the inside bottom of the storage case.

Bausch & Lomb Optical. Co., Rochester NY.#643, The Reseach model microscope, c. 1878. Sub-stage.

Bausch & Lomb Optical. Co., Rochester NY.#643, The Reseach model microscope, c. 1878. In storage case

Bausch & Lomb Optical. Co., Rochester NY.#643, The Reseach model microscope, c. 1878. Storage case.

 

The following was extracted from the Bausch & Lomb Price List of Microscopes, 1879

The Research Microscope is constructed after an entirely new pattern. It has a neatly japanned iron arm and base, the latter inlaid with soft rubber pads, and of such construction and weight as to counterbalance the instrument at any inclination of its body. Finely finished brass pillars supporting the axis, which permits the body to incline at any angle. The tube has nickeled inner draw tube, giving a range of three inches. Coarse adjustment by rack and pinion; fine adjustment by micrometer and screw acting on our patent fine adjustment. This new style of fine adjustment is a peculiar feature of all our higher priced microscopes. It consists of two parallel blades of thin spring steel, placed one above the other , each fastened with one end to the arm, with the other to the body, and acted upon by a fine micrometer screw attached to a lever protruding from the body, by means of which the latter may be raised or depressed, with extraordinary delicacy of adjustment. It has no lost motion, and, having no friction, is not liable to deterioration. The stage is made of brass, and is made as thin as is consistent with firmness and freedom from tremor. The mirror bar is hung on a point placed above the stage and between this and the arm. It swings to any obliquity and any angle above the stage for the illumination of opaque objects. With 1 "B" eyepiece and two objectives, 1 inch and 1/4 inch, camera lucida, and black walnut case....$45

Gundlach microscope patent us182919

The fine adjustment is described in Gundlach patent Oct. 3, 1876

Research model B&L microscope.. The early version

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