C. Kellner in Wetzlar, Belthle & Rexroth, No. 451, c. 1861
microscope is cased with a number of accessories that include
three eyepieces numbered I-III and five objectives numbered 0,
1, 7, and two 3's. The 0, 1, and one of the 3 objectives are
signed "Belthle & Rexroth". One number 3 objective is now
defective (its front element is now mounted backwards!) and it
was presumably replaced by the original owner with another
number 3 signed "Belthle". The number 7 objective is unsigned
but is engraved with the number "1337"; this lens appears to
be a later addition although it has the same non-standard
thread as the other objectives. Also included is a substage
Nicol prism that mounts onto a dovetail slot located on the
mirror arm and an analyzing prism that mounts within the body
tube by screwing into the back of the nosepiece.
The rectangular stage has an oxidized brass finish and there are no provisions for stage clips. Inset under the stage is a wheel with five apertures. An accessory substage apparatus slides into a dovetailed fitting under the stage. This apparatus holds an aperture stop which can be moved up or down relative to the specimen by means of a lever.
This is an example of the largest size model produced by the firm; See: C. Kellner in Wetzlar gegründeten Instituts Nachfolger: Belthle and Rexroth Price list for 1862 . Unfortunately, the production archives retained by Leica Microsystems GmbH of microscopes made in the early period of the Optical Institute in Wetzlar do not have an entry for this microscope and therefore the original purchaser will remain unknown. It was purchased for this collection in the USA.
For more information about this microscope, related instruments, and the history of the Leitz firm see the article: Some Early Microscopes from the Optical Institute in Wetzlar
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