The mirror can be postioned above the stage to illuminate opaque objects.

The polarizer mounted on the microscope. The analyzer mounts on a fitting that inserts into the draw-tube of the microscope.

From:  Behrens Guide to the Microscope in Botany, 1885

Schrauer's Physicians Stand

A very solid and serviceable instrument of this type is the Physician's Microscope of L. Schrauer of New York, shown in Plate VIII A. The body is large, admitting an ocular of 32 mm. in diameter, and is adjustable by means of its drawtube to any length from 16 to 25 cm or more. The diaphragm is inserted in the stage; and a glass sliding stage is provided, in the Zentmayer style held in position by a spring with ivory tip. Such a stage has a smooth motion and wide range, is available for use with the Maltwood finder (a photographed scale of great use for recording the exact location of mounted objects on a slide and enabling them to be promptly found when wanted again), and is unaffected by those reagents which might in certain cases, mar a brass stage. The joint by which this stand is inclined has a set screw for securing it in any position. The disk of the swinging mirror bar is graduated as in all the higher class stands of this type, for the purpose of determining the obliquity of illumination or the angular aperture of objectives.