Compound achromatic microscope, stand ‘Kima’

Description

A good example of a pre-war student microscope, with a cast iron horseshoe-shaped foot with pillar and a dito limb that hinges in the pillar. There is a simple stage, below a condenser with its adjustable stop and a holder for filters. There is a mirror in a swing arc on a limb. The limb ends in a double block with the coarse and fine adjustment acting on the body tube, which has a triple nosepiece changer.
The only eyepiece is signed ‘Busch’, it must be a replacement. Its focal length is 19.92 mm, the magnification is 12.55×.
There are two objective lenses, signed ‘2/3 Argus No.187396’ and ‘1/6 Argus No. 187174’. Both have been investigated using the Bleeker microscope with a 160 mm body tube. The ‘2/3’ with a 10× Huygenian eyepiece, the ‘1/6’ with a 5× Huygenian eyepiece.

The ‘2/3’is good, all its aberrations are well corrected. The ‘1/6’ is in good condition as well, it only showed a trace of coma. It resolves the Pleurosigma angulatum diatom into dots.