This paper compares two methods of calculating depths from refraction data where the subsurface consists of a series of horizontal layers with velocities V 0 < V 1 < V 2 , etc. Equations are developed for calculating depths from the horizontal distances to the intersections of the various segments of the time-distance graph (the break-points). Examples are worked out to show that the error in depth due to an uncorrected change in thickness of the weathered layer is much less when the depths are calculated from break-points than when they are calculated from time-intercepts. In many areas weathering corrections should be unnecessary if the depths can be calculated from the break-points by the method outlined here.

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