Bausch & Lomb Optical Co., Rochester and New York City, #16221

The final version of the Professional Model microscope, c. 1894

Bausch & Lomb Optical Co., Rochester and New york City, #16221. The final version of the Professional Model microscope, c. 1894

Bausch & Lomb Optical Co., Rochester and New york City, #16221. The final version of the Professional Model microscope, c. 1894

Bausch & Lomb Optical Co., Rochester and New york City, #16221. The final version of the Professional Model microscope, c. 1894

Bausch & Lomb Optical Co., Rochester and New york City, #16221. The final version of the Professional Model microscope, c. 1894

Bausch & Lomb Optical Co., Rochester and New york City, #16221. The final version of the Professional Model microscope, c. 1894

Bausch & Lomb Optical Co., Rochester and New york City, #16221. The final version of the Professional Model microscope, c. 1894

Bausch & Lomb Optical Co., Rochester and New york City, #16221. The final version of the Professional Model microscope, c. 1894. stage and slide carrier

Bausch & Lomb Optical Co., Rochester and New york City, #16221. The final version of the Professional Model microscope, c. 1894. substage

     

The calibrated stage is capable of full rotation and has centering adjustments. The substage has independent calibrated movements of the mirror and condenser arms. The microscope is equipped with the B&L patented (1877) glass stage and slide carrier, which is described in The Journal of the Royal Microscopical Society, 1882 as follows:

 

Bausch and Lomb Optical Co.'s Glass Stage and Slide- carrier. This (Fig. 128) is intended as a substitute for the mechanical stage to a certain extent. It consists of a polished plate of glass, incased in a brass ring, which clamps on the circular stage. The slide-carrier, which moves on it, consists of a light metallic plate, and has protruding from its lower surface four small points; at its two ends are prolongations, which are bent downward and inward, and, acting as springs, press against the lower surface of the glass. As the contact between glass stage and slide- carrier is only in these six points, friction is reduced to a minimum, and the action of the latter, although firm, is smooth and steady. It is claimed that it enables work to be done with far more facility than in the ordinary brass stage, where the entire surface of the slide bears on it, and that it is altogether more agreeable. The slide- carrier is provided at each end with small milled heads for manipulation, and has spring clips and a stop for Maltwood finder.

Bausch & Lomb Optical Co., Rochester and New york City, #16221. The final version of the Professional Model microscope, c. 1894. with accessories

Among the accessories are three B&L objectives with canisters marked 2/3, 1/6, and 1/12 water immersion, three eyepieces marked 2, 1, and 1/2-inch, a triple nosepiece, an alternate quick change nosepiece, and a B&L safety nosepiece. The substage consists of a rack and pinion focusing Abbe condenser with iris diaphragm and off-center adjustment.

Bausch & Lomb Optical Co., Rochester and New york City, #16221. The final version of the Professional Model microscope, c. 1894. In storage case

Bausch & Lomb Optical Co., Rochester and New york City, #16221. The final version of the Professional Model microscope, c. 1894. Walnut storage case

This microscope represents the final version of the Bausch & Lomb Professional Model microscope. It primarily differs from the earlier versions with respect to the shape of the limb and the use of a similar fine adjustment mechanism that was used with the contemporary B&L continental style microscopes. This fine adjustment mechanism was later patented in 1897. In addition, the Abbe condenser used on this version of the Professional model is similar to those that were used with the continental model microscopes that were manufactured at the time. Within a few years after this microscope was made, the Professional Model was discontinued; only the continental style microscopes were then offered by the firm.

fine adjustment used on the B&L continental models

Patented fine adjustment: Feb. 16, 1897

late model professional B&L microscope

The history of the development of this model is described in the article:

The Bausch & Lomb Optical Co.s Professional Model Microscopes. 1876-1896

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