Abstract
IN addition to the method of observation mentioned by Mr. Ackroyd in his photometric proposal (NATURE, vol. xxi. p. 627) I may mention that the variations of the diameter of the pupil are very beautifully observed by a pair of punctures in a screen over the eye. In fact long ago I used this as a means of observing the absolute diameter of the pupil, subject to a small unexamined constant error.
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P., W. Dilatation of the Iris. Nature 22, 220 (1880). https://doi.org/10.1038/022220a0
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DOI: https://doi.org/10.1038/022220a0
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