Bausch & Lomb Optical Co., Rochester NY

Early version of the Investigator model microscope, c. 1880

(No serial number)

Bausch & Lomb Optical Co., Rochester NY. An early version of theInvestigator model microscope, c. 1880

    Bausch & Lomb Optical Co., Rochester NY. An early version of theInvestigator model microscope, c. 1880

Bausch & Lomb Optical Co., Rochester NY. An early version of theInvestigator model microscope, c. 1880

Bausch & Lomb Optical Co., Rochester NY. An early version of theInvestigator model microscope, c. 1880

Bausch & Lomb Optical Co., Rochester NY. An early version of theInvestigator model microscope, c. 1880. Substage

Bausch & Lomb Optical Co., Rochester NY. An early version of theInvestigator model microscope, c. 1880

Bausch & Lomb Optical Co., Rochester NY. An early version of theInvestigator model microscope, c. 1880. Case and accessories

Among the accessories are two objectives, two conventional eyepieces, three solid high power eyepieces marked 1/2, 1/4, and 1/8 with adapter, custom made Abbe condenser, later double nosepiece, and a substage diaphragm constructed of hard rubber.

This instrument is an example of the earliest version of the Investigator model as indicated by having the mirror glasses mounted in hard rubber. The tripod base is thinner and also has a different shape than that found on later versions, two of which are shown elsewhere on this website. Curiously, this microscope does not have a serial number, which is usually stamped on the inside bottom of the wood case, and it also lacks the Oct. 3, 1876 patent date, which is usually engraved on the limb.


Extracted from the Journal of the Royal Microscopical Society, 1881

Bausch and Lomb Investigator microscope, 1881

Investigator: The general form of this instrument sufficiently appears from Fig. 6. The main tube has two draw-tubes, which is claimed to be an " entirely new feature in Microscopes, and an unquestionable improvement. It permits the use of the standard length of tube for quick adjustment in outside tube, the same as in instruments without rack and pinion adjustment; it serves also for any low power objective, and the amplifier can be used in either combination. The outside tube has a broad-gauge screw, and an adapter with the Society screw. The stage lies in the same plane as the centre of movement for mirror; it is of brass, and has concentric revolving motion. The mirror-bar swings upon one bearing, to any obliquity below and above the stage for the illumination of opaque objects, and has attached to it a secondary bar, to which the mirror is fitted, and which allows the separate use of the latter in any position of the substage. It is provided with a sliding arrangement, whereby the mirror may be moved to and from the object. The substage is adjustable along the mirror-bar, and entirely removable. It contains a diaphragm which may be brought directly under the stage. The ring is of standard size, and is centered by a set-screw."


This microscope was purchased from the great, great, grandson of the original owner, Dr. Joseph Byron Hayes II (1834-1890). The following was extracted from A History of Ontario County, New York and Its People, vol II, pg 5, 1911:

"Dr. Joseph Byron (2) Hayes, son of Joseph Byron (1) and Sarah (Antis) Hayes, was born in Canandaigua, May 11, 1834. He prepared for college at Canandaigua Academy, from which he entered Williams College, graduating with the class of 1854, and his professional studies were completed in the medical department of the University of Pennsylvania, where he was graduated a doctor of medicine in 1860. His life was spent in Canandaigua, in the practice of his profession. He was an active member of the county and village medical societies and was a deacon of the Congregational Church from early manhood until his death, which occurred July 17, 1890. On September 24, 1861, he married, in Canandaigua, Louise Anne Coleman, born in Frederick, Maryland, September 24, 1833, died in Canandaigua, March 22, 1884, daughter of Chester and Eliza (Graham) Coleman, of Canandaigua. Children, all born in Canandaigua: Edward Graham, mentioned below; George Byron, born July 20, 1865; Chester Coleman, July 31, 1867; Harriet Louisa, May 16, 1871, died April 21, 1875."

Dr. Joseph Byron Hayes II (1834-1890)

Dr. Joseph Byron Hayes II (1834-1890)


US patent 182919

Gundlach microscope patent us182919

Bausch & Lomb Optical Co. Investigator model microscopes

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