This microscope
represents the final version of the Bausch & Lomb
Professional Model microscope. It primarily differs
from the earlier versions with respect to the shape
of the limb and the use of a similar fine adjustment
mechanism that was used with the contemporary B&L
continental style microscopes. This fine adjustment
mechanism was later patented in 1897. In addition,
the Abbe condenser used on this version of the
Professional model is similar to those that were used
with the continental model microscopes that were
manufactured at the time. Within a few years after
this microscope was made, the Professional Model was
discontinued; only the continental style microscopes
were then offered by the firm.