MODEL
MICROSCOPE. This microscope was originally
constructed in compliance with a generally expressed
demand for a simple, low-price and well-made
instrument, which is adapted to every grade of work,
and claim that in it we have a model which possesses,
in an eminent degree, these qualities. Probably no
low-price instrument has ever been offered the public,
which has been so favorably received and met with such
ready sale as this. It is of chaste design, its parts
arc all calculated to bear the strain of every-day
work, and on this account and because of its
simplicity, it may be used by inexperienced hands,
without detriment or injury to it. This microscope
especially recommends itself by requiring a smaller
pecuniary outlay than any of similar construction, and
may be supplied with valuable additions, such as our
revolving and glass stages, mirror-bar with adjustable
mirror and sub-stage, all of which greatly increase the
efficiency and add but little to the price of the
instrument. The tripod base, pillars and arm, are
neatly japanned; the axis is arranged with strong
bearings to allow inclination of the body to any angle.
Coarse adjustment is by perfect rack and pinion,
provided with tightening screws; fine adjustment by a
delicate micrometer screw, acting on our patent
movement. As at present constructed, the arm is
considerably lengthened to allow the more convenient
use of low-power objectives, as well as the double,
triple and quadruple nosepieces. The stage is of brass,
circular in form, thin to allow great obliquity, but of
sufficient strength to be firm under manipulation.
Attached to its lower side is a sub-stage ring and
revolving diaphragm, both of which maybe removed. The
main tube is arranged with cloth lining, in which the
draw-tube is fitted; it is provided with the society
screw to receive low-power objectives, amplifier or
analyzer of polariscope. Plane and concave mirrors are
of large size, adjustable on the mirror-bar, which is a
feature possessed by few low-price instruments,
although it is of considerable importance, from the
fact that a change in the distance of the light
requires a corresponding adjustment of the mirrors; the
mirror-bar swings on a large bearing (the axis of which
lies in the plane of the stage) to any obliquity below
and above the stage, the latter for the illumination of
opaque objects.
The Bausch & Lomb mechanical stage can be adapted to any Microscope which will admit of a stage 3 1/2 in. in diameter. The movements are all contained on the upper surface of the stage, and it can therefore be completely rotated. It is thin and will admit the use of very oblique light.