The test image was taken with an overall magnification of 100
(objective 10x, eye-piece 10x) and a simple torch illumination.
Description of the Leitz microscope
This type of microscope on the basis of the so-called "international" design
was sold with minor variations by the most reknowned U.S. and European
manufacturers in the 1920s.
The Leitz company instrument shown here has the serial number 222813.
It comes with a monocular draw-tube, a rotatable nosepiece with three
standardized thread objectives (10x "3",
45x "6" and "1/12" oil immersion), a round,
rotatable object table with rubber coating and a complicated "Abbe"-type
condenser with two iris apertures one of which can be de-centered for
use of raking light. Only separate knobs for coarse and fine focussing
were available at this time. It has a double, concave and plane mirror and
was built around 1925. The price is depending on the mood of the salesmen
and the mood of the customer, in the range between 200 and 300 US $.
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