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An X-ray film unit is described for measuring residual stress in large parts. The tube and camera are supported and rotated by an adjustable mechanism on a large table capable of supporting large steel parts. Cameras are used which have cylindrical cassettes. This enables a more convenient application of the technique of fitting a parabola to intensities across a diffraction peak to accurately determine the peak maximum. Intensities are corrected for angle-dependent factors. A theoreticaldoi:10.2472/jsms.17.1059 fatcat:ndr4s3lveraefku2tpxniwou7e