Abstract
The paper describes a method of analysing stereoscopic photographs which has been found suitable for the examination of Wilson cloud tracks. The method consists essentially in replacing the photographic plates in the cameras, illuminating them and tracing out the common image which coincides in space with the object originally photographed. A system of movable pin points is used to trace out the contour of the image, the adjustments of the cameras being kept exactly the same as when the photographs were taken. The chief advantage of the method is its simplicity - practically no computation is required and it is not necessary to know the stereoscopic angle, the magnification, etc. The method has been used by the authors to measure the ranges of secondary β-rays and in investigations on the initial directions of emission of photoelectrons, and it has been found convenient and accurate.
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