The tube length can be extended using the draw-tube.
The mirror is mounted
on a swinging arm attached to a disk calibrated in
degrees. The mirror can be positioned above the stage
to illuminate opaque objects. The Abbe condenser is
housed in a focusing mount, which is pinned into
place at the underside of the stage, thus allowing it
to be quickly removed or attached. In addition, there
is an aperture wheel with 5 apertures inset into the
stage surface.
Accessories include two
eyepieces, three objectives with the brass canisters
signed Hartnack & Prazmoswski and numbered 2, 4,
and 7, an Abbe condenser with side-in aperture stop,
a double objective changer, and a brass and glass
slide carrier. Schrauer never made his own objectives
and supplied his microscopes with objective made by
other firms, both American and European. The
objective changer incorporates adapters that allow
the use of objectives with the Hartnack female
thread; these can be screwed off, which then allows
the use of lenses having the RMS thread. The wood
storage case for this microscope is a
replacement.
Although this
microscope resembles the continental style
microscopes that were prevalent at the time, the fine
adjustment mechanism on this instrument is atypical
of that usually associated with the continental form.
In contrast to a conventional continental microscope,
this microscope utilizes a lever mechanism, which
only moves the tube with the limb being held
stationary. In addition unlike a typical continental
model, the mirror on this microscope is mounted on a
swinging arm capable of being positioned above the
stage. The microscope is signed on the base as above.
Leopold Schrauer first began the manufacture of
microscopes in Boston. By 1877, he was located in New
York City at various addresses. Schrauer microscopes
are relatively uncommon. In the book entitled A
Short History of the Early American Microscopes
by D. Pagitt, it is stated "It is somewhat
strange that Schrauer's microscopes are not more
common today, since he was apparently in business for
more than 20 years. This may be partially explained
by Schrauer's proclamation that he gave no discount
to the trade which would indicate that he did not
have access to the traditional marketing
agencies".