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X‐ray diffraction spots on films vary in area and are uneven in density. An instrument is described, which, after calibration against a standard intensity scale imprinted on the film, scans the spot by a light ray, and transforms transmitted light pulses into linear functions of intensity by electronic means. A figure, proportional to the intensity of the spot, is obtained on a mechanical counter. The integrating process is fully automatic, and measurement of one spot takes about a minute. Reproducibility depends on the relative intensity of the measured spot, and can be raised up to 1 percent.

A simple large range digital readout micromanometer has been designed and fabricated. The innovative feature is a suitable gear train which transmits the rotational motion of the lead screw to a 5‐digit reversible mechanical counter. The digital readout makes the data collection easier, convenient, and less liable to reading errors.