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The iris attachment, which at first seems to resemble an objective, was invented by Sidle & Poalk and reported in the JRMS on page 1053 of volume III part 2, 1880, coincidentally reported the same year this microscope was made.
The iris attachment, which at first seems to resemble an objective, was invented by Sidle & Poalk and reported in the JRMS on
page 1053 of volume III part 2, 1880, coincidentally reported the same year this microscope was made.