Letter | Published:

Measurement of Radiation Intensity by Photographic Methods


IN a letter to NATURE of Jan. 16, 1926, p. 83, Dr. F. C. Toy criticised the use of calibration curves in photographic spectro-photometry: but the grounds for his objections were rather the difficulties in the way of adequate calibration than any quarrel with the main assumption involved, namely, the essential uniformity of the plates of a single batch. Recently, however, Miss C. H. Payne and Mr. F. S. Hogg have concluded that each of their plates requires separate calibration, a conclusion fully borne out by the sample curves given by them in Harvard Circular 301.

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