E. Leitz, Wetzlar, No. 253025

The MOP model petrological microscope, c. 1925

For use with reflected or transmitted polarized light

E. Leitz, Wetzlar, No.253025 The MOP model petrological microscope, c. 1925

E. Leitz, Wetzlar, No.253025 The MOP model petrological microscope, c. 1925

E. Leitz, Wetzlar, No.253025 The MOP model petrological microscope, c. 1925

E. Leitz, Wetzlar,
No.253025 The MOP model petrological microscope, c. 1925

E. Leitz, Wetzlar, No.253025 The MOP model petrological microscope, c. 1925

E. Leitz, Wetzlar, No.253025 The MOP model petrological microscope, c. 1925

E. Leitz, Wetzlar, No.253025 The MOP model petrological microscope, c. 1925

    This particular example is fully equipped for observations using reflected or transmitted polarized light. Note that the Bertrand lens, which has a built in mechanism for focusing, can be screwed onto the 8X eyepiece. Special low power oil immersion objectives are supplied. The objectives are corrected for a 215 mm tube length. In use, the draw-tube should be set to zero (fully extended).

E. Leitz, Wetzlar, No.253025 The MOP model petrological microscope, c. 1925

The following was taken from the 1929 Leitz Catalog of Microscopes:

E. Leitz, Wetzlar, The MOP model petrological microscope

POLARIZING MICROSCOPE "MOP"

This microscope which has been designed in collaboration with Prof. Schneiderhoehn is primarily intended for the examination of crude ores having one surface ground plane and polished. It is, however, likewise available for every other kind of petrographical and metallurgical work. Microscope "MOP" is adapted for investigations under transmitted as well as reflected light. Both modes admit of the use of polarized light.

The stand is equipped with inclination joint. The coarse focus is effected by rack and pinion and the fine adjustment by micrometer screw. The object stage can be raised and lowered by rack and pinion motion. The stage is circular and provided at its periphery with scale and vernier. The objectives are interchanged and centered by means of the three-point objective clutch and centering adapters, the clutch being attached to a vertical illuminator in a stationary manner. For investigation in transmitted light, the microscope "MOP" may be supplied with the petrological illuminating apparatus, the latter being equipped with either a "Nicol," "Glan-Thomson," or "Ahrens" prism as may be preferred. For investigation in reflected polarized light, a polarizer is provided which is inserted into the entrance tube of the vertical illuminator. The analyzer is mounted within the tube on a slide fitting and is of the anastigmatictype; it can be rotated within an angle of 90. For the reception of compensators, the tube is provided with a slit. For use with microscope "MOP" a special set of objectives is furnished, all of which are corrected for a tube length of 215mm. These objectives are adjusted for examination of opaque objects and at the same time are free from polarization. During use, the microscope draw tube should be set to its zero mark. The special set of objectives which we recommend includes two low-poweroil immersions, the importance of which for examination of opaque ores is well evident.

Microscope "MOP" as described, complete with anastigmatic tube analyzer on slide fitting; large vertical illuminator, equipped with total reflecting prism and reflecting glass plate, iris diaphragm and illuminating lens; objective clutch changer with three objective adapters; polarizer to fit entrance tube of vertical illuminator; object stage with rack and pinion for vertical motion and clamp by which to arrest the rotating motion; selenite plate, red, 1. order, in metal mounting; mica plate, 1/4λ, in metal mounting; "Huyghenian" ocular 8X with adjustable eye lens and cross-webs, in cabinet.

Accessories that could be supplied with the MOP model:

MOP accessories

      accessories

LARGE VERTICAL ILLUMINATOR

A total reflecting prism and a reflecting glass plate are simultaneously mounted to a bar. The bar, fully inserted into the illuminator housing, places the total reflecting prism within the optical rays and when the bar is withdrawn to its extreme stop, the reflecting glass plate is within the optical rays. The use of either depends upon the nature of the specimen and the objective employed. This vertical illuminator is furthermore equipped with a condensing lens and iris diaphragm, by means of which the light rays can be stimulated for proper contrast. A removable polarizer fits into the entrance tube of vertical illuminator.


c.s. Stephano

A brass tag on the top of the storage cabinet reads: C. S. Stephano, Elkins Park, Penna, U.S.A. Constantine S. Stephano along with a brother operated a tobacco business out of Philadelphia. The business was active from the late 19th century and was named the Stephano Brothers. The business was later carried on by other family members and was sold in 1974. C. S. Stephano was granted a number of patents related to tobacco product manufacture.

Stephano Brothers

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