A geometrical procedure is developed for determining the theoretical profile of the main beam intensity for the Kratky low angle x‐ray diffraction camera. Agreement of experimental and theoretical profiles for a variety of camera geometries is excellent. In contrast to an estimation of the beam width by extrapolation, which may be misleading under certain circumstances, the experimental determination of the entire profile provides an accurate check of the camera alignment for all operating conditions. Furthermore, the area under the theoretical profile furnishes a relative measure of the total useful main beam intensity. This information may be used to determine the optimum values of the camera parameters for operation at any desired maximum resolution.

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A set of operating instructions was furnished with the 1963 series camera.
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9.
According to Kratky2 the optimum counter slit window is w = b.
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