Abstract
IN confirmation of Mr. F. Peake Sexton's contention in NATURE of September 2 (p. 275), that irradiation plays no appreciable part in the necessity for thin lines on the Benham top, I may add that the colours are equally well seen when the top is viewed (1) through a narrow diaphragm held close to the eye; (2) through a magnifying lens; (3) in the monochromatic light of the sodium flame.
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BENHAM, C. The Benham Top. Nature 81, 335 (1909). https://doi.org/10.1038/081335c0
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DOI: https://doi.org/10.1038/081335c0
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