92 8 
Tas_e II. 
P = maximum pressure. 
I (c), I (p) = time integral of pressure measured by copper gauges and plasticine 
gauges respectively. 
The arrows represent three directions from the charge, ~ being the direction from 
the charge towards the “‘ Malapert.” 
P. I (). T£p). 
Shot. 
| 
17 = = = = = 100 100 = 
20 = = = = = 100 103 = 
22 = = = = = 100 91 = 
23 = = = = = 100 97 = 
25 ss = = = = 100 95 = 
27 _ _ _ ~ — 100 92 133 
29 ss = = = = 100 = 100 
30 = — = = 100 90 98 
32 = = = = = 100 108 = 
33 — — — —_— —_ 100 104 — 
ae = Be, ee = 100 97 97 
35 Ey a = = = 100 98 103 
36 _ -- _— — —_— 100 96 — 
37 _ -- _ — — 100 105 — 
38 — _— — —_ —_— 100 88 94 
44 = = — _ 100 96 106 
45 _— —_ _— —_ a 100 88 94 
46 100 106 — 100 103 100 101 —_— 
47 —_ —_ —_ —_ —_— 100 102 —_— 
49 100 100 —_— 100 96 —_ — == 
50 100 95 — 100 98 _— — — 
5) = = == — — 100 111 _ 
52 — — _— — — 100 88 = 
53 100 94 — 100 95 — — 
55 a — _ — 100 98 
56 _— _ — _— — 100 108 — 
57 100 95 — 160 94 —_— _ — 
58 100 96 — 100 100 _ a — 
59 -- — _— _ — 100 103 — 
60 Joo |} 100 — 100 104 _— _— = 
61 100 | 206 = 100 102 = = = 
62 100 105 —_— _ — 100 104 
63 100 101 — 100 95 —_— _— 
65 100 103 —_— —_ — _ —_— — 
66 100 96 — 100 100 —_— —_— = 
67 100 98 —_— 100 98 —_ —_— — 
68 100 104 — — — 100 108 114 
69 100 104 —_— 100 108 _ —_— —_— 
f(ll 100 100 — 100 105 —_— — = 
72 100 _ 104 _ — — —_— _— 
74 100 —_— 104 _ — a _ —_— 
81 100 — 106 == — = = _ 
84 100 95 —_ 100 94 — — = 
85 100 107 _ — = — _ 
86 100 102 — — —_— _ _— 
87 100 103 —_— — —_— _— _ — 
88 100 100 — _ _— _ = = 
90 100 108 — — _ _ _ _— 
94 — -- -- 100 97 — — _— 
95 100 97 _ 100 95 — _— 
98 100 101 —_— _ _— _— _ — 
100 100 106 — —_— _ _ —_ _ 
103 100 102 —_— —_— —_ _ _— _ 
104 100 105 — _— —_ _ —_— 
(6) Velocity of the Pressure Wave. 
‘The experiments described in Section 23 proved that the velocity of the pressure 
wave is, within a few per cent., the same as that of sound in sea-water, or about 
4,900 feet per second. 
