Miniature French Pocket Microscope in a Coffin-shaped Case, c. 1870
The microscope as shown measures only 4.5-inches in height
The following is extracted from Das
Mikroskop und Seine Anwendung by H.Hager,
1879
The following is an English translation:
Pocket microscopes (French make) have also been on the market for about 10 years,
at prices of 12-27 Rmk., but without this being a noteworthy It would be difficult
to recognize difference. The neat case (de, Fig. 34) is 12 cm long, 3.5 cm high.
Therein lies the small microscope, which lacks nothing except the fine
adjustment mechanism. The adjustment is done by shifting the tube; it is easy
by the way and offers no difficulty. The microscope can be laid down by means
of a joint located at the lower end of the stand (g) and the foot (f) placed
parallel to the stand. The mirror (s) hanging in a fork is concave and rotatable
about its axis. The table (f), which is something very small, has two fixed
stage clips. The magnifications reach 50 to 60 times. The images are clear and
satisfyingly sharp. Since these pocket microscopes are shown in the factory,
so of course there are some less useful copies. Of course you do not have to
buy these. A problem with these pocket microscopes, which are very practical for
wandering botanists and naturalists, as well as for domestic use, is the too
small object table.