Letter | Published:

The Choice of Wave-lengths for Achromatism in Telescopes


REFERENCE to my paper on the above subject was made by Prof. Townsend Smith in NATURE of October 11, 1924, p. 536, and my reply appeared in the issue of November 1. Although fully endorsing his findings, writing then as I did from Cornwall, I was unable to go much further. I have now returned to my laboratory here.

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