The following was
extracted from The Illustrated Price List of
Microscopes, Microscopic Apparatus, Lenses, &c.,
for Sale by T. H. McAllister, 1876.
T.H. McAllister's
Student's
Microscope
A neat serviceable
instrument, well made, and in every way adapted for a
good "working" Microscope. Particularly recommended
to Physicians and Students of Medicine, as embracing
a range of magnifying powers, ample to meet the
ordinary demands of medical men. The powers of 50 and
75 diameters answer admirably for the examination of
Sections of Bone and Teeth, Tissues of the Body,
&c., while the powers of 250 and 400 diameters
will be of great value for determining the
characteristics of Blood Globules, Pus, Urinary
Salts, &c, Many interesting minutiae of insects
and vegetable life can be readily observed by the
lower powers, and with the highest power, 400
diameters, delicate striae of diatoms 30,000 lines to
the inch call be resolved.
The STUDENT'S
MICROSCOPE stands twelve inches high when inclined as
shown in the engraving. The Base is Bronzed, with
uprights to receive the axis upon which the body
inclines. The Body is of Brass with Extension Draw
Tube. The coarse adjustment for focus is by a
delicate watch chain, controlled by large milled head
on each side of the tube. This adjustment is
extremely sensitive and exact, even with the highest
power of the instrument. There is also a fine
micrometer adjustment attached to the stage. The
Stage is of Brass with Brass Springs to hold the
Object, and with Diaphragm plate beneath; Stage
Forceps attach to the Stage, which are very
convenient for holding an insect, flower, etc., while
being examined by a low magnifying power. The Concave
and Plain Mirrors are mounted with universal motion
on jointed bar. The mounting for the Objectives is
made with the "London Society Screw."