on Dec 17, 2016
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By 1874, Bausch and Lomb produced their first compound microscope and then -- seemingly overnight in 1900 -- the Bausch & Lomb Company became the leading American manufacturer of microscopes
The optical system consisted of a brass body tube with revolving double nose-piece -- a nickel-chrome plated draw tube graduated in single millimeters to 220 mm
The tubes were 30mm in diameter and perfectly constructed to permit a large cone of light to pass from the objective
Optical "course" adjustments were made by diagonal rack and pinion, moving along a prismatic slide precisely fitted and attached to the body
"Fine" adjustment was accomplished by a micrometer-screw that was silvered and graduated with 100 divisions, each representing a motion of the objective of 1/100 mm
The revolving slide stage is 100mm (4") in diameter and made of a brass plate fitted with a vulcanite top
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