brass Wenham binocular microscope circa 1870-75
exceptional Wenham style brass binocular microscope with extensive
accessories. The microscope
is signed on the base, Henry Crouch, London, 977.
The early serial number, coupled to the lack of spiral focus rack
(introduced by Swift in 1878) help to date the instrument to circa 1870-75. The microscope measures 14 Ό tall when closed, but
opens to a working height of about 16.
It has a rotating mechanical slide stage, rack and pinion coarse
focus, and typical Crouch nose piece micrometer knob fine focus.
Eyepiece width is hand adjustable, as was typical on the earlier
models. The instrument is
in excellent operational condition.
The optical system consists of two original pair of binocular
eyepieces, four original Crouch objectives (2, 1, 2/3, and Ό),
and one later Crouch 1/12 oil lens.
The combination of focal lengths are a perfect compliment to a
Wenham binocular, which produces binocular vision with lenses of ½
and less power. The set
includes an exceptionally rare, original triple nosepiece made entirely
of brass, and with open ends that attest to its very early origins.
The four original lenses are excellent, producing exceptionally
crisp images of good color and contrast.
The later Crouch oil lens may be missing an element.
The Wenham prism is in excellent condition.
Substage condensers include a wheel of stops, a dark field
optical, and a variable spot parabolic.
The plano-concave mirror is excellent on both sides with only
very minor spotting. Accessories
include a standing bullseye condenser, stage forceps, brass tweezers,
two different camera lucida eyepieces, a parabolic reflector,
compressorium plate, and brass slide, in addition to the triple
microscope is finished in lacquered brass with a black japanned base.
The original lacquer is complete with some typical age wear
overall. The entire set is
included in its original hand dove tailed mahogany case with brass carry
handle, lock and key. The
case is in excellent condition, noting a small section missing from the
back right lid, and some age cracking to the wood.
Several things make this Crouch a perfect instrument for anyone
wanting a working model. First,
it is in excellent mechanical condition with exceptional optics that
include an ideal assortment of lenses to compliment the Wenham binocular
system. Second, it has a
rare triple nosepiece allowing a quick change of the lenses.
Finally, it comes in a manageable, practical size that is
comfortable to use. In
short, a winning combination overall.