At the time this
microscope was manufactured, it was the largest model
sold by the firm. Interestingly, one of the
objectives supplied with this instrument, a 1/8 with
correction collar, was made specifically for this
microscope by J. Grunow of New York, suggesting that
at some point in its history this microscope made its
way to America and was used there during the 19th
century. As with the Merz objectives, the Grunow
objective has engraved on the canister with the
magnifications achieved with the four different
eyepieces. The Merz objectives are a 1/3, 1/9, and
1/18 (immersion) with correction collar.
On the basis of the
1866 Merz price list shown below, on the number
oculars supplied (4), and the fact that it has the
rack and pinion coarse adjustment, this instrument
most closely conforms to Stativ Nr. I, Microscop Nr.
3. There are unoccupied fittings within the case,
which most likely held a bullseye condener.
The Merz firm was
founded in 1839 by Georg Merz (1793-1867) after
taking over the business started by Joseph
Fraunhofer. After a brief partnership with Joseph
Mahler, the firm continued on with Georg's sons
Ludwig (1817-58) and Sigmund (1824-1908). By 1858,
instruments were signed as G. & S. Merz. In later
years the firm was run by Sigmund's cousins Jakob and
Matthias Merz. See this short biography of Georg Merz (in
The Merz delivery books
have an entery for serial number 866 as
September 4. 1868: Röhrer (Ertel & Sohn)
1 Microscop Nr. III mit Nr. 866 mit 3
1/3", 1/9". 1/18" Immersion & corr,
4 Ocularen 1, 1 1/2, 2, 3,
micrometer in 1 1/2 für 1/9" I = 0.004 mm Deckgl. 8
für 1/9" und 1/18" ....154 fl.
The firm Ertel
& Sohn was a maker and retailer of
scientific instruments located in Munich with a
workshop near that of G. & S. Merz.