Dissecting microscope with erected image after R. Pfeiffer.
The Dissecting microscope with erected image according to Prof. R. Pfeiffer has been constructed in such a way that all parts extending on both sides can be folded or turned, so that the instrument fits in a very small case.
The base consists of two parts which may be folded. The stage can be brought in a position vertical to the optical axis and the metal hand rests laid on top of the stage. They are connected with the latter by joints. The mirror can also be turned and put parallel to the pillar.
A round glassplate is set in the stage, below which is an iris diaphragm to properly regulate the illumination.
The adjustment is by rack and pinion.
Two rightangle prisms are mounted inside the tube in such a manner that the image obtained by the objective is reflected into the eye-piece and appears erected.
The eye-piece is of the Ramsden form. Three objectives of different magnifying power with specially long working-distances have been constructed Nos. 1, 2, 3.
The following table shows the magnification of the objectives in connection with the eye-piece.
| Objective | 1 | 2 | 3 |
| Magnification | 18 | 40 | 80 diam. |
| Working distance | 58 mm | 18 mm | 6 mm |