Zeiss Continental brass microscope with quad nosepiece

A large and impressive Continental style microscope by Carl Zeiss.  This stand is 12” tall in fully closed position.  It has a 4 ¾” diameter rotating circular stage, and a quadruple nosepiece with four original Zeiss lenses.  The slide stage has two adjusting thumb screws for micro mechanical adjustment of the slide position.  The optical tube is signed, “Carl Zeiss, Jena, No. 34985.”  The microscope dates to circa 1900.   Coarse focus is rack and pinion, fine focus is an indicator micrometer knob.  The sophisticated substage consists of an Abbe condenser with variable iris diaphragm.  The diaphragm assembly can swing out of the light path, and can provide oblique illumination by means of a rack and pinion gear mechanism.  The condenser lens also swings down and out of the light path.  There is a separate control for a second, upper iris diaphragm above the condenser lens.   The plano-concave substage mirror is in very fine condition on both sides.  The four original Zeiss lenses come with their own labeled brass canisters, and are marked as: aa, AA, DD, and 1/12 oil immersion.  Two eyepieces complete the optical set, which is typical of Zeiss quality.  The microscope is finished in lacquered brass with a black base. The lacquer coverage is complete, noting some typical age wear.  The original mahogany has a brass carry handle and comes with lock and Zeiss key with “Z” logo.  The case is in excellent usable condition.  This is the largest version of the Continental microscope by Carl Zeiss.  It is both an impressive and sophisticated instrument -- the pinnacle of achievement for its type. 

Item 1394

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