James W. Queen & Co., Philadelphia and New York

The Student Model Microscope, c. 1874

James W. Queen & Co., Philadelphia and New York. The Student Model Microscope, c. 1874

James W. Queen & Co., Philadelphia and New York. The Student Model Microscope, c. 1874

James W. Queen & Co., Philadelphia and New York. The Student Model Microscope, c. 1874

focusing mechanism

As opposed to the normal rack and pinion, the tube focuses by turning the knobs to activate friction drive consisting of a metal cylinder which is forced, by means of a brass spring, against a grove cut within a brass bar attached to the tube.

Extracted from the 1870 Queen catalog:

1665. Queen's Student's Microscope. This stand has been designed and constructed by us especially to meet the wants of students and profesaional men, combining, with excellent workmanship, most of the advantages of the more elaborate instruments, at less than one-third of their cost. The very highest powers may be used with it perfectly. Its height is 14 inches. The base and arm are of iron, fin shed in ligbt-green bronze; whilst the body and all other parts are of brass of the very highest finish. The coarse adjustment is of an entirely novel construction, working with entire smoothness; fine adjustment by micrometer screw; movable glass stage, beneath which a tube is fitted for carrying the diaphragm and accessory illuminating apparatus; concave and plane mirrors, arranged for direct and oblique illumination, fitted with Society Screw. Price of stand with one eye-piece, draw-tube, two object glasses Number 0 {1 inch), and Number 0 (1/4 inch), giving powers from 60 to 250 diameters, condensing lens on separate stand, a glass slip, with ledge and ccovers, for the examination of objects in fluid, needles, stage forceps, and brass pliers, packed in a handsome polished walnut cabinet, with good lock and brass handles  .    .   .    .    .    .   .    . $65.00

 

Queen Student's microscope in the cse

1878 Queen microscope advertisment

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