Bausch & Lomb Optical Co.

Investigator model microscopes

left: serial No. 3634, c. 1885     right: serial No. 6818, c. 1890

B&L investigator microscope 3634

B&L investigator microscope 6818 stored  in the case

B&L investigator microscope 3634. Wood case

B&L investigator microscope 6818. Wood case.

Bausch & Lomb Optical Co. Investigator model microscopes

From the catalog of August Stendicke, New York: Illustrated & Descriptive Catalogue of Optical Instruments c.1890

THE INVESTIGATOR  MICROSCOPE

In this stand I confidently claim to have reached a higher degree of perfection than is possessed by anyone approximating it in price. It combines, in a moderate-priced instrument, the features of a first-class and high-priced stand at no sacrifice of its working qualities. The different parts are ingeniously combined, are strong and firm, and in the parts subject to friction I have introduced, as much as possible, new compensating bearings, which enable the instrument to endure any amount of work and still retain smooth and reliable movements, Working microscopists will understand the value of this quality. When contracted, it stands but 11 inches high, but can be extended to 18 inches.

The base is of brass, and has the tripod form: pillar and arm of brass, connected by a solid joint, which allows inclination of body to any angle; rack and pinion for coarse adjustment, fine adjustment by our patent frictionless motion; main tube, with two draw tubes. This is an entirely new feature in Microscopes, which is an unquestionable improvement. It permits the use of standard length of tube for quick adjustment ill outside tube, same as in instruments without rack and pinion adjustment; the same for any low power objective and the use of amplifier in either combination. The outside tube has a broad gauged screw, and adapter with society screw. The stage lies in the same plane as centre of movement for mirror, is of brass, and has concentric, revolving motion with removable clips. It is thin to allow great obliquity, and, as it rests upon a strong projecting arm, is perfectly firm under any manipulation.

The mirror-bar swings with a perfectly easy but firm motion, upon one bearing to any obliquity below, and above the stage for the illumination of opaque objects, and has affixed to it a secondary bar, to which the mirror is attached and which allows the separate use of the latter in any position of the sub-stage. It is provided with a sliding arrangement, whereby the mirror may be moved to and from the object. The mirrors are plain and concave, and of large size. The sub-stage is adjustable along the mirror-bar and entire removable. It contains a diaphragm which may be brought directly under the stage. The ring is of standard size and is easily centered by a set-screw. Steel pin for centering stage and sub-stage accompanies the instrument.

Eye-pieces A and C, the latter arranged with slot for micrometer. Objectives, 3-4 inch and 1-5 inch.
Camera lucida, eye-piece micrometer, pliers, slides and covers. Magnifying powers, 35 to 600 diameters.
In upright walnut case, with handle and lock, drawer for accessories, and receptacles for eye-pieces and objectives,  - $70.00
The above, when double nose-piece is ordered with it, - 75.00
Same stand, with any power eye"piece, in above case,  - 45.00
The above, with improved glass stage and slide carrier, which fastens to the brass stage, extra, - 5.00

Patents

US patent 182919

Gundlach microscope patent us182919

US patent 328277

Bausch and Lomb microscope patent us328277

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