The following was
extracted from the 1886 Bausch & Lomb
catalog:
No. 513 - STUDENT
MICROSCOPE.
This microscope is the
result of a series of experiments to reach the utmost
efficiency and simplicity at an exceedingly low
price. We have constructed it on the principle of the
concentric or rocking motion of the arm, by which the
instrument becomes more firm the further it is
inclined. We have embodied in it a new roller motion
for the fine adjustment, which works without lost or
lateral motion.
In order to make up a
complete low-price outfit, we have given special
attention to the optical parts, and as a result have
devised two " Special " objectives ; 1 inch 15õ and
1/4 inch 65õ, which, although low priced, may be
relied upon as giving as good results as can be
obtained with such angular aperture. They are
perfectly achromatic, with penetration and good
resolving power, the 1/4 showing the lines on P.
Angulatum, while it has very long working distance.
Where price, however, is not the principal
consideration, we would invariably recommend the
selection of our higher grade objectives.
Everything pertaining
to the instrument is well made and finished, and we
feel sure will not only redound to our credit, but
will also fill a popular demand.
The base and arm are
neatly japanned; the latter may be made to swing with
an easy motion from the upright to a horizontal
position, and may be fastened at any intermediate
point by means of the milled head in the pillars. The
coarse adjustment is by sliding tube, and this in
turn is provided with draw-tube, while both have
society screw; fine adjustment is by delicate
micrometer screw.
The stage has spring
clips; on its lower surface is attached a revolving
diaphragm, fixed to a separate arm by means of which
the diaphragm may be swung out of the optical axis;
the stage is also provided with a screw, to which a
sub-stage may be attached. The mirror is concave and
is attached to a bar, the axis of which lies in the
plane of the stage, so that illumination may be
brought on the object from any point below or above
the stage.
No. 513, Stand with one
eye-piece, in cherry case,.....$13.50
No. 514, Stand, as
above, with rack and pinion for coarse
adjustment,:....20.00
No. 513 A, No. 513 with
1 inch and 1/4 inch "Special" objectives; magnifying
powers 80 to 375 diameters,...26.00
No. 514 A, No. 514 with
1 inch and 1/4 inch" Special" objectives; magnifying
powers 80 to 375 diameters,....32.50
No. 513 B, No. 513 with
1 inch (No. 604) and 1/4 inch (No. 608
or 609); magnifying powers 80 to 375
diameters,.....33.50
No. 514 B, No.
514 with 1 inch (No. 604) and 1/4 inch (No. 608 or
609); magnifying powers 80 to 375
diameters,....40.00
Sub-stage ring, to
receive any sub-stage accessories,
extra.....1.00
Sub-stage with
revolving diaphragm, extra,....2.50
Glass stage and
slide-carrier, extra,.....5.00
Gundlach patent Jan. 21,
1879
The method used to incline
this microscope is based on that of the "New
Working Microscope" first introduced by George
Wale.