Bausch & Lomb Optical Co.

Pat. Oct. 3, 1876 and Oct 13, 1885

The Professional Model Microscope with full mechanical stage

Bausch & Lomb Optical Co. Pat'd Oct. 8, 1876 and Oct. 13, 1885. The Professional model microscope

Bausch & Lomb Optical Co. Pat'd Oct. 8, 1876 and Oct. 13, 1885. The Professional model microscope

Bausch & Lomb Optical Co. Pat'd Oct. 8, 1876 and Oct. 13, 1885. The Professional model microscope. Stage

Bausch & Lomb Optical Co. Pat'd Oct. 8, 1876 and Oct. 13, 1885. The Professional model microscope. Stored in the case

Bausch & Lomb Optical Co. Pat'd Oct. 8, 1876 and Oct. 13, 1885. The Professional model microscope. Substage

Pat. Oct. 3, 1876

Gundlach microscope patent us182919

Pat. Oct 13, 1885

Bausch and Lomb microscope patent us328277

From The Journal of the Royal Microscopical Society, 1882

Bausch and Lomb Optical Co.'s Professional Microscope. Fig. 113 (cut from America, is one of the best woodcuts of a Microscope which we have seen) shows the "Professional" Microscope of the above Company. Its specialities are the frictionless fine adjustment (described at p. 683), the glass stage and slide-carrier (described at p. 687), the centering of the substage (of which we have no detailed description), the two draw-tubes which allow of more than the ordinary variatious of length, and the mirror and substage bars which are separate and can be moved independently of one another, or simultaneously when the arm on the mirror is placed in a recess in the substage bar.

 

 

Bausch and Lomb Optical Co.'s Fine Adjustment. Fig. 126 represents the original of the fine-adjustment referred to at Vol. I. (1881) p. 110. Two strong parallel blades of finely tempered steel, a a, are securely fastened on one end to the back of case Fig. 126. d, on the other to the arm e, which carries the rack and pinion, b shows the micrometer screw, which is fitted to the upper part of the upright arm c, f is the pinion, g the rack and slide, h the tube. Two screws fasten the adjustment case d to the pillar c. An arm projects from the part e and passes into a recess in the pillar c. The springs support the entire body, and as their tension is upward, the projecting arm bears continually against the micrometer screw b, and it is evident that tho distance traversed by tho screw involves the same movement of the arm e, and consequently the body. The only points of contact are at the ends of the springs a, a, where they are fastened respectively at d and e, and on the micrometer screw, and as in the former there is absolutely no friction, there is no wear; while that which may eventually take place in the latter is taken up by the force of the springs.

The points of excellence claimed by the makers for this adjustment over all others, are the following: 1. It moves the entire body. 2. It is extremely sensitive and direct. 3. It has no lateral motion or displacement of the image, while adjusting. 4. It has absolutely no lost motion. 5. It can in no manner deteriorate.

Bausch & Lomb Optical Co.  The Professional model microscope.

 

Bausch & Lomb fine adjustment


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

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

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