Abstract

The problem of depth determinations from data obtained by the method commonly called “reflection shooting” is an interesting one and one which, very often, assumes an importance that justifies a good deal of study. It is the purpose of this paper to indicate a method for depth determination in two cases which very closely approximate some situations. It turns out that the discussion leads to a set of charts which are universal in the sense that the charts are based on dimensionless quantities and are therefore applicable to any set of units and for any “spreads” desired. Inasmuch as “average vertical velocities” are often used in practice, the cases considered in this paper are compared with the results obtained by using the “average vertical velocities,” and it is found that for short “spreads” the depths obtained by either method check very well.

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