The following is an excerpt from the Zentmayer 1895 catalog:
DISSECTING MICROSCOPE - B
This instrument was chiefly designed to meet the
requirements of Prof. J. T. Rothrock, of the
University of Pennsylvania, in has botanical classes;
but it is quite sufficient for general dissecting
purposes. It is made entirely of brass, handsomely
polished, and consists of a circular base five inches
in diameter, upon which stands a stout pillar
supporting a commodious stage, four by five inches in
dimensions. The stage has a recessed circular opening
one and three quarter inches in diameter, holding a
removable glass disk, for which suitable dishes can
be substituted for dissecting in fluids. Removable
spring clips are provided for retaining objects under
observation. The stage is only three-and one-half
inches high, and extensive enough to afford
comfortable support to the hands in working. The
plane mirror has complete movements, and an opaque
white back for modified illumination. The lenses are
held by a socket in a jointed arm affixed to an
upright bar moved by rack and pinion in the pillar
supporting the stage. It is furnished complete with a
Dissecting System of two Single Lenses, respectively
of one inch and three- quarters inch focus, forming
by combination a doublet of two-thirds inch focus
giving amplifications from ten to twenty diameters.
Stand and neat Walnut case with Draw for Lenses and
Dissecting Instruments. ............... $10.00