& Lomb Model brass microscope circa 1890
very complete set of the Bausch & Lomb Model microscope that
was made from 1883-1896. It
is signed, A Bausch & Lomb, Optical Co., on the stage, and
comes with its original three eyepieces and two lenses.
The closed height is either 12 ¼ or 13 ¼,
depending upon which eyepiece is in place.
The limb design was attributed to Gundlach when he
was with the Bausch & Lomb firm. This design was both practical and
popular, and lasted well into the 20th century. The eyepieces are numbered as 2, 1, and ¾.
The lenses are a ¾ and 1/8, both signed with original
signed brass canisters by Bausch & Lomb. The
original optical system is superb for its era, producing excellent
images of high contrast, sharpness, bright color, and extreme flatness
of field. Coarse focus is
rack and pinion, and fine focus is achieved with a micrometer knob on
top of the limb. The mirror
is plano-concave, excellent on the plane side, and showing age spotting
on the concave side. The
mirror can rotate on a compass joint so that it can be used above stage
for oblique illumination of opaque subjects.
The substage condenser is a wheel of stops.
The microscope is finished in lacquered brass with a black
painted base. The finish is
complete with some spotting to the optical tube and stage.
A mahogany case with brass carry handle and interior accessory
drawer holds the microscope and its accessories.
The case is in very fine, usable condition with lock but no key,
and noting some typical age cracks to the back.
This is a very fine example of an early American instrument
made all the more interesting by its accompaniment of accessories.
Its rare, fine condition makes a handsome display, while its
excellent optical system makes it a joy to use.