Abstract
DR. W. EWART WILLIAMS has recently published in NATURE1 an interesting article on ” Light-Waves as Units of Length”. In a memorandum entitled ” Les idées actuelles sur la définition de l'unité de longueur”2, which appeared in 1927 (and which I admit is now somewhat out of date), I discussed this question in detail, and the conclusion at which I arrived was on the whole but little different from that of Dr. Williams. There is, however, one point which I should like to touch upon again in reply to the doubt expressed by him regarding the accuracy of 0.2 attainable with line standards.
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References
NATURE, 135, 459 and 496; 1935.
” La Création du Bureau international des Poids et Mesures et son uvre”. Paris: Gauthier-Villars, 1927, p. 259.
” Procès-Verbaux des séances du Comité international des Poids et Mesures”, Deux. série, 15, 30; 1933.
See Ch.-Ed. Guillaume, ” Les Récents Progrès du Système métrique”, pp. 14 and 15; 1934.
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PÉRARD, A. Precision of Line Standards. Nature 136, 104–105 (1935). https://doi.org/10.1038/136104a0
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DOI: https://doi.org/10.1038/136104a0
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