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To remove the difficulties mentioned in the second footnote on page 207 and 208, and, at the same time, to give further meaning to the mathematical developments and results which are of basic importance, we shall begin by examining in yet another way the initial problems implied in the integrations of the preceding Lesson.

From the meaning of the parameter p and the discussions leading to equations (2) on page 204, it is apparent that, at a point Qat depth h (see Figure 100), at which depth the seismic velocity is, of course, v(h), the angle a between the direction of the wave-path through Qand the vertical is such that

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