. Impact with a Liquid Surface Studied by the Aid of Instantaneous Photography. Paper II. ick. Using a fall of 204 centimes., we found by nakedeye observation that the water absorbed in six hours did not suffice to change thesplash, while that absorbed in twelve hours always sufficed. These observations throwa striking light on the determining importance of the initial motion. It should bementioned that in Series XXVIL the temperature of the glycerine was 15° (1, and inSeries XXVIII. was 12° C, except in the last figure, when the fall was 100 the temperature 22°. Further experiment
. Impact with a Liquid Surface Studied by the Aid of Instantaneous Photography. Paper II. ick. Using a fall of 204 centimes., we found by nakedeye observation that the water absorbed in six hours did not suffice to change thesplash, while that absorbed in twelve hours always sufficed. These observations throwa striking light on the determining importance of the initial motion. It should bementioned that in Series XXVIL the temperature of the glycerine was 15° (1, and inSeries XXVIII. was 12° C, except in the last figure, when the fall was 100 the temperature 22°. Further experiments with viscous liquids are very desirable, as they may enable usto pass by gradual transition to phenomena which at first sight may appear to be farremoved. For if any one will compare with fig. 2 of Series XXVII., the accompany-ing photograph of the permanent record left of the splash which a steel projectilemakes on entering a hard steel armour plate on the entering side, he will find itdifficult to resist the belief that the plate has behaved like a liquid. Yet even the E ig. whole kinetic energy at disposal in such an impact would not suffice to raise theprojectile itself through more than a few hundred degrees Fahrenheit, still less tomelt at the same instant any appreciable quantity of metal, and we are thereforedriven to the conclusion that under the enormous pressure due to the impact thephysical properties of the material of the plate have been so far altered as to changeentirely the conditions of liquefaction, Worthingto7i & Cole. PhiL Trans., A, Vol, 194. Ym. 1. Series XII. Fig. 2. Fig. 3.
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