E. Hartnack & A. Prazmowski,

Rue Bonaparte 1, Paris, #13936, c. 1875

Continental style microscope with under the stage fine adjustment

E. Hartnack & A. Prazmowski, Rue Bonaparte 1, Paris, #13936, c. 1875
E. Hartnack & A. Prazmowski, Rue Bonaparte 1, Paris, #13936, c. 1875

Note that the upper portion of the microscope can rotate relative to the base.

 E. Hartnack and A. Prasmowski, #13936

objectives

This is an example of the large non-inclining model having the fine adjustment control located at the rear under the stage. The microscope comes equipped with three eyepieces, six objectives where five are stored in a leather covered box and the last one is stored in a brass canister, a sub-stage aperture stop holder with three stops of different apertures, an Oberhäuser type camera lucida, and a free standing bullseye condenser.


Oberhauser camera lucida

The following describes the use of the Oberhäuser camera lucida:

Oberhauser camera lucida

 

For drawing microscopic objects the camera ludica will be found useful. This is a small glass prism attached to the eye-piece. The microscope is inclined horizontally, and the observer, looking into the prism, sees the object directly under his eye, so that its outlines may be drawn on a piece of paper placed on the table. Some practice, however, is needed for satisfactory results. For the upright stands of German and French microscopes, the camera lucida of Chevalier & Oberhäuser is available. This is a prism in a rectangular tube, in front of which is the eyepiece, carrying a small glass prism (c, Fig. 17), surrounded by a black metal ring. A paper placed beneath is visible through the opening in the ring, and the image reflected by the prism upon it can be traced by a pencil. It is necessary to regulate the light so that the point of the pencil may be seen.


Edmund Hartnack (1826-1891) biography

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