Binocular by Crouch – circa 1885
large and impressive Wenham style binocular microscope of the
first-class, it is signed, “Henry Crouch, London, 4542” on the base.
Standing 16” when closed, the instrument weighs 15 pounds.
It features rack and pinion coarse focus.
Fine focus is with an indicator micrometer knob located on the
side of the limb and marked, “Patent”.
Eyepiece width is adjustable with a rack and pinion mechanism.
The elaborate rotating circular mechanical stage has full rack
and pinion lateral movement. Micro
movement of the slide stage is also possible by adjusting two knobs on
the sides of the stage. The
substage condenser holder is height adjustable and is hinged to swing
out of the way. A knob
controls rotation of the condenser that is in use.
Two other knobs control the lateral adjustment of the condenser
within two dove-tail joints. The
3” plano-concave mirror is excellent, noting some age staining on the
plane side. The microscope
is very solidly built and comes with a full range of accessories in a
separate mahogany accessory case. The optical system consists of three pairs of binocular
eyepieces and one high power monocular eyepiece, along with five lenses
in matching brass canisters. Lenses
include a 3” by Swift, a 1” with canister signed “H. Crouch”, a
½” in “H. Crouch” canister, a ½” in “H. Crouch” canister,
a ¼” Swift with correction collar, and a 1/8” Ross with correction
collar. All lenses are of
very high quality and cosmetically excellent. A double nosepiece adapter is included in the set.
There are four condensers: a single optical, a spot lens, a
parabolic with center spot, and a nicol prism with matching nosepiece
analyser for polarization work. Other
accessories include a parabolic reflector for opaque specimens, a live
box, and a disc holder that fits into the condenser assembly and holds a
brass live box disc. The
lenses and accessories fit into their own mahogany case with brass
latches, one of which is missing. The
microscope comes with a large hand dove- tailed mahogany case with brass
carry handle, lock but no key. The
microscope is finished in lacquered brass.
The lacquer coverage is complete, in very good condition, and has
a mellow copper tone. The
microscope makes a commanding display with its elaborate stage,
extensive accessories, and large size.