Bausch & Lomb Optical Co., Rochester NY

Pat. Oct. 3, 1876

Serial No. 76

The Professional model microscope, c. 1876

Bausch & Lomb Optical Co., Rochester NY, Serial No. 76, Pat. Oct. 3, 1876. The Professional model microscope, c. 1876

Bausch & Lomb Optical Co., Rochester NY, Serial No. 76, Pat. Oct. 3, 1876. The Professional model microscope, c. 1876

Bausch & Lomb Optical Co., Rochester NY, Serial No. 76, Pat. Oct. 3, 1876. The Professional model microscope, c. 1876

Bausch & Lomb Optical Co., Rochester NY, Serial No. 76, Pat. Oct. 3, 1876. The Professional model microscope, c. 1876. Stage and substage

 

Bausch & Lomb Optical Co., Rochester NY, Serial No. 76, Pat. Oct. 3, 1876. The Professional model microscope, c. 1876. Stored it its wood case.

Bausch & Lomb Optical Co., Rochester NY, Serial No. 76, Pat. Oct. 3, 1876. The Professional model microscope, c. 1876. Accessories

Many of the accessories are made of hard rubber. This is a characteristic of the earliest B&L instruments. This microscope was designed by Ernst Gundlach while employed by Bausch  & Lomb. The low serial numner (76), which is stamped on the inside bottom of the case, indicates that this instrument  was manufactured in the first year of production.

glass stage

Gundlach patent Oct. 3, 1876     

Gundlach microscope patent us182919

Extract from the 1879 Bausch & Lomb Catalog:

 

 

 

The Professional Model from the 1879 catalog

 

PROFESSIONAL MICROSOPE.

The leading idea in the construction of this microscope was to furnish at a moderate price an instrument suitable to the application of a variety of accessories, desirable in many operations of the microscope, thereby enabling the operator to perform a variety of microscopical work for which our lower priced instruments are inadequate.

It is provided with a heavy brass foot, highly finished, inlaid with three soft rubber pads at the under surface, and two solid brass pillars supporting axis for inclination of the body. Two strong screws with milled heads, placed at the ends of the axis, serve to tighten or loosen the connections by means of which the arm can be made to move with more or less ease.

Coarse adjustment by rack and pinion, moving a long prismatic slide accurately fitted, attached to the body, and arranged for compensation of wear. Fine adjustment by micrometer screw, with milled head, silvered and graduated, acting upon our patent movement described in preface.

Glass stage with slide holder similar to that described with microscope No. 540, but is of larger dimensions, circular in form not shown in cuts, and fitted to receive the hemispherical immersion condenser. In this stage we gain thinness, while still maintaining its stability.The slide carrier moves in any direction, and also revolves.

Substage and mirrors (plane and concave) are fastened to swinging mirror bar, the axis of which is fixed in the plane of the object, thereby permitting the accessories and mirror to swing concentrically around the object. The mirror may be brought to any obliquity and swung above the stage for the illumination of opaque objects. The mirror as well as the substage, can be moved on the mirror bar to and from the object, and both can be removed altogether, in an improved manner not shown in the illustration.

The substage ring receives the revolving diaphragm, condenser, etc., and auxiliary ring with internal society screw, which accompanies the instrument, and to which objectives and other auxiliaries may be fitted.

 

Three periscopic eye-pieces, B (No. 605), C (No. 860), and D (No. 865), the latter arranged with slot for micrometer.

Four objectives, 2 inch (No. 605), 3/4 inch (No. 615)), 1/5 inch (No. 640), 1/8 inch immersion, adjustable for cover correction (No. 975).

Hemispherical immersion condenser (No. 975).

Range of magnifying power, from 30 to 800 diameters. In upright walnut case, with handle, lock and key, drawer for accessories and receptacle for objective and eye-pieces.....$200.00


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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