A quantitative study of distortion in nuclear emulsions, based on a method of measuring and calculating distortion to known accuracy, has been made. The method has been applied to a study of variations in fixing washing and drying procedures. Distortion reduction up to one‐half was found to occur with the use of a concentrated sodium sulfate hypo solution. The reduction of vertical shrinkage and the use of thicker emulsions also appear to reduce distortion. The method of distortion measurement is accurate to better than 10 percent using sea‐level cosmic‐ray background tracks as a distortion indicator.

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