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Points from Foregoing Letters

Nature volume 143, page 686 (22 April 1939) | Download Citation



W. L. BRAGG describes a direct method of converting the measurements of X-ray beams diffracted by a crystal into an optical image of the atomic arrangement as projected upon a given plane. Holes are drilled in a thin plate, arranged in the pattern of ‘cross-spectra’, and proportional in area to the amplitudes of the diffracted beams. If this plate is placed in front of the objective of a telescope focused on a point source of monochromatic light, the beam passing through the holes forms by interference an image of the crystal structure which can be seen, through the eyepiece.

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