Compound microscope by Hartnack,
1876/77

Signed: E.Hartnack Paris & Potsdam

Case: 28 x 14 x 10,5 cm

This is a stand VIII microscope by Eduard Hartnack Potsdam (or Paris?) of 1876/77. The instrument is made entirely out of lacquered brass and is the smallest horse-shoe base offered by Hartnack. Raw adjustment is via sliding-tube, the fine focus is achieved via a prism-adjustment in the column. The table is equipped with a hard-rubber layer.
The horse-shoe base is protected by a fine leather-layer in order to avoid damage of the microscope and table and vice-versa.The mahogany case has a lid padded with velvet silk and a small compartment for slides and cover glasses. The brand-mark in the case shows the serial number 17278.
The pull-out-tube has the standard-length of 160mm introduced by this workshop in Paris as it was still run by Oberhäuser. Illumination is achieved with a concave-mirror and a cylindrical aperture-stop with three different inserts. This cylinder may be pulled out on a dovetail slide to the side in order to enable changing the aperture without moving the object to be examined and without changing the position of the mirror.