Model experiments on the head wave are described. Quantitative data are obtained for three different pairs of media: light lubricating oil on top of a saturated solution of calcium chloride, water on top of wax, and water on top of concrete. Within the limits of experimental error these data agree with the theoretical prediction that the head wave should decay with distance as r (super -1) 2/L (super -3) 2/ (Heelan, 1953).
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P. N. S. O’Brien (1955) studied this question.