Abstract
IN their letter to NATURE of October 20 (p. 238), Messrs. Zeiss suggest, by implication, that British optical instruments are inferior to those of German manufacture. The following may be of interest:
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BROWNING, K. The Development of Optical Industries. Nature 108, 305 (1921). https://doi.org/10.1038/108305b0
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DOI: https://doi.org/10.1038/108305b0


