Abstract
THE attention given, in this laboratory and elsewhere, to the effects produced by passing a beam of Röntgen radiation through crystals suggested to me that it might be of interest to examine the image produced when a narrow pencil of ordinary light falls on a photographic plate after passing through a crystal. The lens was removed from a camera, and in place of it there was attached a tube about 30 cm. in length and 3 cm. in diameter. The tube was lined with black velvet, and provided with three diaphragms pierced with pinholes from one-half to three-quarters of a millimetre in diameter. In this way I endeavoured to secure that a cylindrical pencil of light of small cross-section should enter the camera. In consequence of diffraction at the last aperture the impression on the photographic plate, when no crystal was interposed, sometimes extended over a considerable area, resembling the diffraction images recently discussed by Mr. J. W. Gordon (Proc. Phys. Soc., vol. xxiv., p. 428, 1912).
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ALLEN, H. Diffraction Patterns from Crystals. Nature 91, 268 (1913). https://doi.org/10.1038/091268a0
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DOI: https://doi.org/10.1038/091268a0
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