Bausch & Lomb Optical Co., Rochester N.Y. U.S.A., #162120, c. 1923

The No. 40 Model Pocket Microscope

Bausch & Lomb Optical Co., Rochester N.Y. U.S.A., #162120, c. 1923. The No. 40 Model Pocket Microscope Bausch & Lomb Optical Co., Rochester N.Y. U.S.A., #162120, c. 1923. The No. 40 Model Pocket Microscope
Bausch & Lomb Optical Co., Rochester N.Y. U.S.A., #162120, c. 1923. The No. 40 Model Pocket Microscope
Bausch & Lomb Optical Co., Rochester N.Y. U.S.A., #162120, c. 1923. The No. 40 Model Pocket Microscope

Note that the mirror can be mounted above the stage for illumination of opaque objects.

Bausch & Lomb Optical Co., Rochester N.Y. U.S.A., #162120, c. 1923. The No. 40 Model Pocket Microscope. Fabric covered case. Bausch & Lomb Optical Co., Rochester N.Y. U.S.A., #162120, c. 1923. The No. 40 Model Pocket Microscope stored in its case. Bausch & Lomb Optical Co., Rochester N.Y. U.S.A., #162120, c. 1923. The No. 40 Model Pocket Microscope. folded.

The microscope is constructed entirely of brass with the main body having a black enameled surface finish. The original lacquered brass B&L objective is divisible and is marked 8-16. Depending on the setting of the draw-tube and the lenses used with the objective, this microscope gives magnifications in the range 60-250. With the draw-tube fully extended as shown in the photos, the microscope measures abou 8.75-inches tall in the inclined position. The main focus is by push tube. The fine focus is accomplished by turning the knurled ring of the outer tube. The mirror is single sided with a concave glass; it can be mounted on an adjustable arm under the stage for conventional use or above the stage for use with opaque objects. The instrument collapses to a small size by pushing in the tubes and folding the legs. The microscope is is stored in a plush lined fabric-covered case measuring 5 1/4 x 2 x 2 3/4 inches and bearing the B&L logo on the cover.


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The Directions for Use of the Pocket Microscope No.40.




The following was extracted from: Transactions of the American Microscopical Society, V16, pp 193-194.

A NEW POCKET MICROSCOPE

A great many American manufacturers produce miniature models which are duplicates of their standard products and which can be used by young folks. One of our largest optical plants has seemingly done a similar thing in producing an extremely small microscope which when folded can be placed in a leather case pocket size. But this microscope, miniature though it is in size, has adjustments and magnifications equal to many standard models. The construction allows telescoping of the draw tube and the use of one or both elements of the divisible objective in such manner as to give a wide range of magnifications up to 250x. With these magnifications it can be used in examining a great variety of objects, transparent or opaque, in the laboratory or especially in field work in botany, entomology, mineralogy and general nature study. The magnification is sufficient for clinical examinations, including blood counting, and due to its portability, the instrument may be used at the bedside of the patient. As mentioned before, in adjustments and operation the pocket microscope resembles the standard models. It is fitted with coarse and fine adjustments which work in easy fashion. The stage is provided with two spring clips which hold the specimen; and the mirror, adjusting in two planes, serves in its regular position under the stage to illuminate trans parent specimens. When detached from the mirror bar, it can be placed on a pin at the side of the arm to illuminate opaque specimens. The instrument is supported by a tripod, the three legs of which fold together and swing back parallel with the tubes and ready to place in the leather covered pocket case, which measures 5 x 2 1/4 x 2 3/4 inches. The microscope weighs 13 oz. and is finished in smooth, durable black.. The eyepiece and divisible objective are of high quality and the instrument in every particular is made to the Bausch & Lomb standard. Already the demand has been surprisingly great and with the popularizing of a real microscope, the company predicts a sale beyond estimates.

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