Signed on the back of the base: L. Schrauer, Maker, New York

and on one leg of the base: W. M. Keene, B. Sc. M. D.

Continental style monocular microscope, c.1890

Signed on the back of the base: L. Schrauer, Maker, New York and on one leg of the base: W. M. Keene, B. Sc. M. D. Continental style monocular microscope, c.1890 Signed on the back of the base: L. Schrauer, Maker, New York and on one leg of the base: W. M. Keene, B. Sc. M. D. Continental style monocular microscope, c.1890
Signed on the back of the base: L. Schrauer, Maker, New York and on one leg of the base: W. M. Keene, B. Sc. M. D. Continental style monocular microscope, c.1890 Signed on the back of the base: L. Schrauer, Maker, New York and on one leg of the base: W. M. Keene, B. Sc. M. D. Continental style monocular microscope, c.1890

The mirror arm can be raised above the stage to illuminate opaque objects from above. Imbedded within the stage is wheel with 5 apertures.

Signed on the back of the base: L. Schrauer, Maker, New York and on one leg of the base: W. M. Keene, B. Sc. M. D. Continental style monocular microscope, c.1890
Hartnack objectives

Leopold Schrauer only made the microscope stands and never made his own objectives. He supplied his microscopes with objectives manufactured by both American and European firms. The optics supplied with this particular microscope consist of two eyepeices and two Hartnack objectives numbered 2 and 7.

Signed on the back of the base: L. Schrauer, Maker, New York and on one leg of the base: W. M. Keene, B. Sc. M. D. Continental style monocular microscope, c.1890. Signature engraved with the owner's name : W. M. Keene, B. Sc. M. D.

One leg of the base is engraved with the name of the original owner of the microscope, W. M. Keene, B. Sc. M. D. So far, I have not been able to locate any information about a medical doctor with that name. It is engraved in the same hand that engraved the Schrauer signature suggesting that the microscope was made by Schrauer specifically for Dr. Keene.

storage case microscope in the case

The microscope, with its horseshoe base and tapered pillar, resembles the continental model that was increasingly becoming more popular during the period. However, the microscope differs from the standard continental microscope in an important way. In the continental model, the fine adjustment mechanism moves the entire limb along with the body-tube. With this Schrauer model however, the fine adjustment is actually a spring-loaded long lever mechanism. One end of the lever engages the screw of the adjustment knob while the other end moves the body tube. The limb remains stationary. The substage of this microscope consists of an aperture wheel embedded in the stage. The mirror slides on its arm, which can be swung in place above the stage for illumination of opaque objects.

A similar continental style microscope is located elsewere in this collection. It differs from the present example in the method used to focus the mirror and the use of aperture stops instead of a diaphragm wheel.

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