W. H. Bulloch, Chicago, Pat. 1879,  #260

The No. 1 Professional Binocular Microscope. c.1883 

W. H. Bulloch, Chicago, Pat. 1879,  #260. The No. 1 Professional Binocular Microscope. c.1883

W. H. Bulloch, Chicago, Pat. 1879,  #260. The No. 1 Professional Binocular Microscope. c.1883

W. H. Bulloch, Chicago, Pat. 1879,  #260. The No. 1 Professional Binocular Microscope. c.1883

W. H. Bulloch, Chicago, Pat. 1879,  #260. The No. 1 Professional Binocular Microscope. c.1883

W. H. Bulloch, Chicago, Pat. 1879,  #260. The No. 1 Professional Binocular Microscope. c.1883

W. H. Bulloch, Chicago, Pat. 1879,  #260. The No. 1 Professional Binocular Microscope. c.1883

W. H. Bulloch, Chicago, Pat. 1879,  #260. The No. 1 Professional Binocular Microscope. c.1883 . the stage

W. H. Bulloch, Chicago, Pat. 1879,  #260. The No. 1 Professional Binocular Microscope. c.1883 . Signature

W. H. Bulloch, Chicago, Pat. 1879,  #260. The No. 1 Professional Binocular Microscope. c.1883 . sub-stage

W. H. Bulloch, Chicago, Pat. 1879,  #260. The No. 1 Professional Binocular Microscope. c.1883 . mirror and condenser move independently

The basis of Bulloch's invention is the independent rotation of the mirror arm and condenser arm around the point defined by the object on the stage. The angular positions of the arms are indicated by silvered scales.

W. H. Bulloch, Chicago, Pat. 1879,  #260. The No. 1 Professional Binocular Microscope. c.1883 . Accessories

While this microscope was purchased without its storage case, it did come with a number of its original accessories among which were a matched pair of eyepieces, two additional higher power eyepieces, four objectives by W. Wales, NY ( marked 1 1/2, 2/3, 1/2, and 1/5 inch, the last with correction collar), a safety nosepiece for monocular use, and a sub-stage Gillet diaphragm.

When this microscope was purchased for this collection, the original surface finish was completely removed by a previous owner. It has now been fully restored to its original condition. On opening the mirror cell, an old circular piece of a postcard was found that was used to separate the two mirror glasses; it has a cancellation date of 1883, thereby establishing a firm date of manufacture for this instrument.


The following was extracted from the 1890 Bulloch catalog:

PROFESSIONAL MICROSCOPE

(Patented 1879)

This instrument has the same general construction as the Congress, but is a smaller instrument. The tubes and binocular arrangement are the same. It has the concentric, rotating and mechanical Stage, with graduations for measuring angles. It is also adjustable; so that it can be accurately and perfectly controlled under a 1/50 objective. There are graduations connected with the horizontal and vertical movements of though stage, by which the exact position of an object can be noted and found with more certainty than with the Maltwood finder. The stage is sufficiently thin to admit an angle of oblique light as high as 157 degrees. The diameter of the stage is 4 1/2 inches, and range of mechanical motion, 1 inch in each direction.

The sub-stage is fitted with complete movements, for central or oblique light; the center of which it revolves is in a plane, with the object on the stage. It has a graduated circle, so that the obliquity with an achromatic condenser can be noted, and can be used at any angle under or over the stage. The sub-stage is made in two parts. The lower, which is adapted for the polarizer, can be swung to one side without disturbing the condenser; and between the upper and lower fittings of the sub-stage, there is an adaptor that swings for the convenience of holding diaphragms or selenites; and for the convenience of changing accessories, the whole sub-stage is arranged to swing on a pivot at one side of the bar. The mirror is arranged to revolve around through the same center as the sub-stage, but is independent until connected. It can be moved over or under the stage.

There is a rack and pinion attachment for focusing the sub-stage, and a micrometer screw movement for centering. The coarse adjustment is by rack and pinion. The fine motion is by a lever, moving though whole optical tube. The milled head is graduated, reading to 1/1000 and is grooved for use in photography. The monocular is fitted with a safety nose-piece. The binocular has an extra safety nose-piece and the adjustment to draw-tubes, for perfect adaptation to individual vision, is by rack and pinion, The instrument in mounted on a tripod base with revolving, graduated platform, upon which the two standards are placed, and between which the instrument may be inclined to any angle, or placed horizontally for drawing, or for measuring the angle of aperture. The center on which the instrument revolves, when fixed horizontally, is in a direct line with the object on the stage. A Gillet diaphragm, which can be placed under the object accompanies each instrument.

(The 1883 microscope shown on this page differs slightly from the 1890 model described above. In particular, with respect to the sub-stage centering mechanism and the orientation of the knobs for the Turell type mechanical stage)


Bulloch's 1879 patent

Bulloch's 1879 patent


Obituary of Walter H. Bulloch as published in the American Monthly Microscopical Journal, 1892

Home Page-Antique Microscopes       Site Index

www.antique-microscopes.com