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Group of workers inspecting small parts under lamps. They are seated on high stools with backs.

Bench Inspectors

Group of workers inspecting small parts under lamps. They are seated on high stools with backs.

"An improved form of apparatus for the fractionation [sic] is represented in fig. 9." —The Encyclopedia Britannica 1910

Apparatus Designed for Spectroscopic Examination

"An improved form of apparatus for the fractionation [sic] is represented in fig. 9." —The Encyclopedia…