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Light-Waves as Units of Length


I WISH to correct an error that occurs in my article on this subject in NATURE of March 30 (p. 496). The mean value of the wave-length of red cadmium in normal air from this table should be 6438.4691 × 1010 metres, and not 6438.4687 × 1010 metres, which is the mean of the last three determinations.

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