It was meant to be a highly portable instrument for the serious microscopist, much like the inverted McArthur microscopes which became popular in the third and fourth quarter of the twentieth century.Research Trinocular Polarizing Microscope Humboldt StateĪ. It was rather expensive in its day, but the optics of this instrumentĪre superb.
Ernst leitz wetzlar microscope 1920a serial numbers#
According to Dan Kile, about 31 or so examples of the Minor are known to still exist, and serial numbers range from 225725 to 311867. The Leitz Minor was apparently made from about 1924 through at least 1934, but did not appear in the 1938 catalog. He also reports that the Auxiliary Equipment set, (with the Bertrand lens), is virtually nonexistent, as no surviving example has thus far(2020), been identified. The Mineralogical accessories kit is rarely seen and Dan Kile reports seeing less than 7 examples. Fully equipped with all of these, this may be the most complete miniature petrographic microscope ever made. The 'Minor 6, Auxilliary Equipment to Mineralogical Accessories' was listed to include a Bertrand lens to thread onto the oculars, a 30X objective, a two-lens condenser for the polarizer, and a set of eight selenites and mica plates to be 'placed upon the ocular'. The 'Minor 5, Mineralogical Accessories includes an attachable rotary stage with vernier and centering screws, an attachable polarizer and analyzer (with the analyzer in a swing-out mount). These included a complete selection of petrographic accessories in two different kits. Additional polarized light accessories were available for converting the Minor into a pol scope. In 1924 it was offered only as one model without a condenser, but by 1929, it could be ordered with the removable substage condenser seen here, and called the 'Minor 2'. High quality portable microscopes became popular during the 1920's, and the Leitz Minor was one of the best of these. Then the pillar, (with the foot folded on top of it), is thenįolded backward on the inclination joint. The mirror stem then is raised up parallel with the body To fold up the microscope for storage, first the tube and draw tube are In my example, I do note slight image shift when using the fine focus. Moderate power it always lacked an oil immersion high power objective. To prevent tipping the scope right or left. Relatively light and that the horseshoe support is just not wide enough The biggest defects of this design are that it is The condenser, using the clips on the bottom of the condenser providedįor the purpose. Include a choice of blue filter or a ground glass, to be placed under As shown in the image to the left, its foot and upright can be used as a handle to pass around the instrument as a 'Demonstration Microscope.' When used as a demonstration instrument, each user would hold it up to the eye with the understage pointed towards a room light or window.
To observe stationary subjects, as shown in the illustration on theĬan be seen at the bottom of this web page. With the low power objective attached and the footĪnd pillar as a handle, it could also be used as a handheld microscope Another way to use this microscope is as aĭemonstration microscope, with a slide on the stage, using the foldedįoot as a handle. Placed on the foot, illumination would be by holding the instrument up For low power views of transparent objects Stage with the stage clips moved to the foot, which has holes toĪccommodate the stage clips. Used for low power views of slides, using the foot as an accessory Special low power objective which, after removal of the condenser,Īllows inspection of a solid surface through the foot it can also be The objective assembly can be exchanged for a Higher power achieved by turning the knurled knob to bring an extraīottom lens into place. The main objective assembly provides two powers with the Coarse focus is by push-pull and fine is by a knurled ring justĪbove the arm which moves the sleeve holding the main tube. Stage is a miniature detachable Abbe condenser with iris diaphragm andĬlips to accommodate a substage filter. The top of the stage for illumination of opaque objects. Swiveling substage mirror which is concave and can be brought around to It arises from a horseshoe foot to an inclination joint. It is signed 'Ernst Leitz, Wetzlar, N o 286794'.
This is a well made, folding, highly portable microscope from the 2nd quarter of the twentieth century.
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