Early geophysical papers of the Society of Exploration Geophysicists . earlygeophysical00soci Year: 1947 94 H. A. WILSON — x = a sin pi + ap2 I / dt > rf/ which gives so that — x = a sin pt -\- ap I (1 — Jo cos />/)/ = pat. Thus in this case the ground moves with uniform velocity ap. The sudden starting of this motion at / = 0 starts the seismograph oscillating freely; with amplitude a but has no further effect on the motion. If a ground wave ar- 12 3 4

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