. The London, Edinburgh and Dublin philosophical magazine and journal of science . 62° •441 39° •006 29° •053 (4) Condensational-rarefactional Wave incident in theGranite. 0° 5° 4314° 226° 3445° 59° 262° 3^73° 1884° 1787° 17 Ax. •041•004•002•043•003•006■664•813•932•962 0. A. •9596° -99416° -99130° -97853° -94875° -89090° 0imaginary. 0. Bv <p. B. 3° •001 4° 001 8° •003 10° 004 14° •007 19° 015 23° •005 30° 044 29° •004 38° 100 30° •131 39° 198 32° •081 43° 106 34° •028 45° 041 34° •014 46° 023 These four cases are shown graphically in figs. 1, 2, 3,and 4. The curves which refer to the second
. The London, Edinburgh and Dublin philosophical magazine and journal of science . 62° •441 39° •006 29° •053 (4) Condensational-rarefactional Wave incident in theGranite. 0° 5° 4314° 226° 3445° 59° 262° 3^73° 1884° 1787° 17 Ax. •041•004•002•043•003•006■664•813•932•962 0. A. •9596° -99416° -99130° -97853° -94875° -89090° 0imaginary. 0. Bv <p. B. 3° •001 4° 001 8° •003 10° 004 14° •007 19° 015 23° •005 30° 044 29° •004 38° 100 30° •131 39° 198 32° •081 43° 106 34° •028 45° 041 34° •014 46° 023 These four cases are shown graphically in figs. 1, 2, 3,and 4. The curves which refer to the second medium aredotted. Undoubtedly the most peculiar are cases (1) and (2). Fornearly all incidences in the one case, and for incidences up tothe critical angle for complete total reflexion in the other, therefracted distortional wave, B, is by far the most for a limited region in the vicinity of the angle at $6 Prof. C. G. Knott on Reflexion and Refraction of ROCK amd ROCK INTERFACE. B e f ■•, •: ii\ B/ B, 06 0-4 Fit. 2 0-g s ■■■■J B/ 0° 20° A40° 60 80° 0° 20° 40° 6a I DlSTO RTION AL INCIDENT DlSTORTIONAL INCIDENT IN SLATE N GRANITE. A A A A 1-0 0 8 0-6 0-4 0 2 A J Ft \ A, R 8,V 0 2 o° 4 0* 6 0° 8 0 06 02 0° 20 40* 60* 80° Condensational incident Condensational incident INS LATE. IN GRANITE ROCK and WATER INTERFACE. V •( Fi c4 A, . B A A Fi :.5 ~T \j 06040-2 / A / \ / ■■■../ { A l / A, / B B 1-0 \ 1 F G.( 1 OB \ \ A 1 1 0-6 \ i j I A B, — / 0-2 t \ A a. /A / / *,- V 20 40° 60° 60° Condensational Wave INCID E NT 20 40° 60 80 DlSTORTIONAL WAVEINCIDENT Elastic Waves, ivith Seismological Applications. 87 which the reflected condensational wave vanishes, 90 per cent,of the whole initial energy is transferred to the second mediumin the distortional form. The curious fall in the B curve,and the corresponding abrupt rise in the A or Ax curves (orin
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