Compound microscope drum-type, by Hartnack,
second half 19th C.

 

Signed: E.Hartnack & Cie / Place Dauphine, 21 / Paris

Case 22,5 x 12 x 7cm

This is a stand I microscope by Eduard Hartnack & Cie of 1870. The instrument is made entirely out of lacquered brass. Raw adjustment is via sliding-tube, the fine adjustment may be done by lifting the table via a side-screw that may be manipulated with one hand lying on the table and thus enabling a fatigue-free work. For transportation or storage the circular foot may be unscrewed and separately stored in the mahogany-case. This case has a lid padded with green silk and a small compartment for slides and cover glasses. The brand-mark in the case shows the serial number 8736.
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 an aperture-stop wheel beneath the table-mechanism. The optical equipment consists of the well-known Oberhaeuser/Hartnack objective No.7 and two eyepieces No. 3 and No.?