Bausch & Lomb Optical Co., patent Jan. 21, 1879, #4819
Student model microscope with Wale limb, c. 1887
Extracted from the Journal of the Royal Microscopical Society 1886:
Bausch & Lomb Optical Co.'s New Student Microscope. The Bausch & Lomb Optical Co have issued the low-priced microscope shown in fig. 201. It is constructed on the Wale principle of concentric inclination of the arm, by which the instrument becomes more firm the further it is inclined. It also has a new roller motion for the fine adjustment, and a revolving diaphragm fixed to a separate arm so that it can be swung out of the optic axis. The concave mirror is attached to a bar, the axis of which lies in the plane of the stage, so that illumination may be directed on the object from any point below or above the stage. The base and arm are japanned, the latter being fastened at any desired angle by means of milled heads in the pillars.
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 15° and 1/4 inch 65°, 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 ¼ inch "Special" objectives; magnifying powers 80 to 375 diameters,...26.00
No. 514 A, No. 514 with 1 inch and ¼ inch" Special" objectives; magnifying powers 80 to 375 diameters,....32.50
No. 513 B, No. 513 with 1 inch (No. 604) and ¼ inch (No. 608 or 609); magnifying powers 80 to 375 diameters,.....33.50
No. 514 B, No. 514 with 1 inch (No. 604) and ¼ 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
The method used to incline this microscope is based on that of the "New Working Microscope" first introduced by George Wale.
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