This microscope is a
simplified version of those produced in the style of
Andrew Pritchard. It is supplied with a single
eyepiece, a stage forceps, a live box, a lower power
non-achromatic objective, and a French type of triple
button objective with canister. The microscope
measures about 14-inches in height when inclined for
use as shown in the photos.
A very similar
microscope, having the same uniquely shaped limb, is
illustrated and described in the book Microscopic
Manipulation by G.T. Fisher published in 1846
where it is referred to as the "Medical Achromatic
Microscope". The illustration from this reference
shows that the firm that made (or retailed?) this
microscope is the optician, publisher, photographer,
and scientific instrument maker T. & R. Willats, London. This
firm (brothers Thomas and Richard) was active at
various addresses in London from 1840s - 1860.
Andrew Pritchard sold a similar microscope.
Achromatic Microscope.—Another form of compound microscope
is represented in the following outline, (fig. 15.) It is
particularly adapted for the examination of anatomical and
physiological preparations, and from being less complicated in
its arrangements is also much less expensive. The stout stand 3
is screwed into the foot 4, and the body 1 is supported by the
arm 2. The object-glasses are at 5, the eye-glass and
field-glass are of course contained in the body of the
instrument; 6 is the moveable stage, and 7 the mirror. The
portability, and at the same time high magnifying power of these
instruments, renders them exceedingly useful.
Figure 16 is a more
recent form of the same instrument; but as its chief difference
consists in being arranged in such a way as to allow of the
instrument being brought into any convenient position by the
joint at 3, no more lengthened detail is requisite. Its internal
construction is essentially the same as the former.