40 
SEE 2 oe Rent 305 
Depth of 
Centre | Depth of ; eat Height of ee Height of 
of Charge. |__ Water. Wind. to Crest |‘ Plumes,” lof “Dome.”| “ Dome.”” 
Feet.) [Pathoma) in Feet). | (Feet.) | (Reet.) | (Feet. 
67 x9 3.2.19] 344 26 E.1 0 130 110 36 
68 c 5.2.19| 18 13 E. 4 1 120 95 28 
69 x8 | 10.2.19] 34} 25 E.N.E. 2 300 | 115 42 
70 D 12.2.19 10 20 E.N.E. 1 i oe — aa 
71 X# 132.19 344 26 0 0 170 pea an 
72 D 14.2.19 10 25 0 0 400 ee am 
73 M 17.2.19| 60 10 I. 4 1 250 400 40 
74 D 19.2.19 10 21 E.S.E. 4 1 400 — — 
75 M 20.2.19 60 10 E. 2 4 180 240 38 
76 M 21.2.19 60 10 E. by S. 2 1 195 290 55 
77 D 21.2.19| 125 25 E. by S$. 2 1 = as 20 
78 M 22.2.19 60 10 E.N.E. 1 s 140 — acl 
79 D 24.2.19 | 125 27 0 0 = = 20 
80 D 24.2.19 | 150 30 0 0 = a 0 
81 X3 25.2.19 49} 29 E.S.E. 3 1} — — == 
82 D 26.2.)9 10 23 E.N.E. 4 1 400 — — 
83 X3 28.2.19 a 30 W. by 8.3 if — — = 
84 AD 1.3.19 34 27 S.S.E. 3 2 180 _ — 
85 X5 4.3.19 60 39 N.W. 1 0 210 = md 
86 xa 5.3.19 60 40 W.N.W. 1 0 180 190 53 
87 X5 12.3.19 60 40 N.E. by E. 3 2 210 _ — 
88 x4 13.3.19 64 45 E. by S. 2 1 220 _— — 
89 x4 14.3.19 64 51 0 0 200 300 53 
90 x4 15.3.19 64 55 E. by N. 1 ; 240 — 55 
91 X6 17.3.19 | 34} 25 | N.W. by N.4 2 80 = 0 
92 X6 18.3.19 | 40 27 S.E. by S. 3 90 ae 0 
93 X6 19.3.19 40 27 S.E. 5 af 110 — 0 
94 x8 20.3.19 34} 21 E.S.E. 3 2 175 = ae 
95 AD 21.3.19 344 21 E. 3 1 195 _— — 
96 D 22.3.19 | 200 48 E.N.E. 2 = = 0 
97 D 24.3.19 5 22 E. 1 — — = 
98 D 25.3.19 344 2t 0 0 160 = a 
99 D 25.3.19 5 21 0 0 650 el — 
100 D 31.3.19| 34 22 N.N.W. 4 14 = 130 40 
101 D 31.3.19 34 25 N.N.W. 4 14 _— — = 
102 X8 31.3.19 34 22 N.N.W. 4 1 150 — x 
103 G 1.4.19 18 13 E.N.E. 2 —_— — = 
104 G 1.4.19 18 14 E.N.E, 2 — a = 
105 D 2.4.19 34 35 W. by S.2 a = =e 
106 D 3.4.19 34 40 W. by S. 1 0 = = oa 
107 D 4.4.19 34h 42 S.W. by W. 2 1 = 120 40 
Shots 73, 75, 76, and 78 were fired on a sand bottom about 14 miles off Irvine; all other shots were 
fired approximately in a line between Troon and Holy Island, over a mud bottom. 
APPENDIX II. 
CALIBRATION EXPERIMENTS. 
(27) Apparatus. 
The copper cylinders which formed the measuring-element of the principal gsuges were calibrated by 
firing steel pistons at them from a pneumatic gun, the velocity of the pistons being measured by an electric 
chronograph, which was developed for the purpose. The gun, shown in Fig. 47, consisted of a shot-gun 
barrel mounted vertically over a massive anvil. The piston was hung by a loop of fine wire from a crows- 
pin, resting in two notches in the upper end of the barrel, so that when compressed air was admitted above 
it it was blown off its support and projected on to a copper cn the anvil, The top of the barrel was closed 
