Abstract
PROF. HARTOG, in his “comments” Nos. 2 and 3, revives an old charge which was made by Mr. Lewis Wright in the English Mechanic (1892), pp. 220–221. Mr. Lewis Wright, in speaking of the use of fluorspar In the production of apochromatic objectives, there states:—
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CHESHIRE, F. “Optical Glass” and Fluorite: an Ethical Note. Nature 97, 181 (1916). https://doi.org/10.1038/097181a0
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DOI: https://doi.org/10.1038/097181a0
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