SHOUT NOTES ON PROFESSIONAL SUBJECTS, 
135 
82. Electro-Ballistic Experiments. —Captain W. H. Noble submits for 
record the following table, giving the calculated remaining velocity and energy, at 
various distances, of projectiles tired from the service M.L.B. guns with battering- 
charges of B.L.G. powder. A similar table, with battering charges of pebble 
powder, is in course of preparation :— 
Range. 
12-inch. M.L.R. 
of 25 tons, 
charge 67 lbs., 
pro. 6001bs. 
10-inch M.L.R. 
of 18 tons, 
charge 60 lbs., 
pro. 400 lbs. 
9-inch M.L.R. 
of 12 tons, 
charge 43 lbs., 
pro. 250 lbs. 
8-inch M.L.R. 
of 9 tons, 
charge 30lbs., 
pro. 180lbs. 
7-inch M.L.R. 
of 6^ tons, 
charge 22 lbs., 
pro.115lbs. 
V. 
Total energy. 
| Energy per inch 
of shot's 
circumference. 
V. 
Total energy. 
Energy per inch 
of shot’s 
circumference. 
V. 
Total energy. 
Energy per inch 
of shot’s 
circumference. 
V. 
Total energy. 
Energy per inch 
of shot’s 
circumference. 
V. 
Total energy. 
Energy per inch 
■ of shot’s 
circumference. 
yds. 
ft. 
ft.tons 
ft.tons 
ft. 
ft.tons 
ft.tons 
ft. 
ft.tons 
'ft.tons 
ft. 
ft.tons 
ft.tons 
ft. 
ft.tons 
ft.tons 
0 
1180 
5793 
154-7 
1298 
4673 
150-0 
1336 
3094 
110-4 
1363 
2319 
93-2 
1430 
1631 
75-0 
200 
1157 
5569 
148-7 
1272 
4488 
144-0 
1300 
2930 
104-6 
1320 
2175 
87-4 
1375 
1508 
69-4 
400 
1137 
5379 
143-6 
1246 
4306 
138-2 
1266 
2778 
99-2 
1279 
2042 
82-1 
1325 
1400 
64-4 
600 
1118 
5200 
138-9 
1220 
4128 
132-5 
1232 
2631 
93-9 
1243 
1928 
77-5 
1278 
1302 
59-9 
800 
1101 
5043 
134-7 
1196 
3967 
127-3 
1200 
2496 
89-1 
1208 
1821 
73-2 
1235 
1216 
55-9 
1000 
1085 
4898 
130-8 
1173 
3816 
122-5 
1170 
2373 
84-7 
1176 
1726 
69-4 
1195 
1139 
52-4 
1200 
1069 
4754 
127-0 
1151 
3675 
117-9 
1143 
2265 
80-8 
1146 
1639 
65-9 
1156 
1066 
49-0 
1400 
1055 
4631 
123-7 
1131 
3548 
113-9 
1119 
2171 
77-5 
1118 
1560 
62-7 
1121 
1002 
46-1 
1600 
1041 
4509 
120-4 
1112 
3430 
110-1 
1096 
2082 
74-3 
1093 
1491 
59-9 
1090 
947 
43-6 
1800 
1028 
4397 
117-4 
1094 
3320 
106-5 
1074 
2000 
71-4 
1071 
1432 
57-5 
1062 
899 
41-4 
2000 
1016 
4295 
114-7 
1076 
3211 
103-0 
1053 
1922 
68-6 
1051 
1379 
55-4 
1037 
858 
39-4 
2200 
1004 
4194 
112-0 
1061 
3122 
100-2 
1034 
1853 
66-1 
1031 
1327 
53-3 
1014 
820 
37-7 
2400 
993 
4102 
109-6 
1047 
3041 
97-6 
1017 
1793 
64-0 
1012 
1278 
51-4 
994 
788 
36-2 
2600 
984 
4029 ! 
107-6 
1033 
2960 
95-0 
1002 
1741 
62-1 
995 
1236 
49-7 
977 
761 
35-0 
2800 
976 
3963 
105-8 
1021 
2891 
92-8 
988 
1692 
60-4 
979 
1196 
48-1 
963 
740 
34-0 
3000 
968 
3899 | 
1 
104-1 
1009 
2824 
90-6 
976 
1651 
58-9 
963 
1158 
46*5 
949 
718 
33-0 
83. On the best means oe ensuring Accurate Practice at Shipping 
prom elevated Coast Batteries. Communicated by Captain J. B. Oliver, B.A. 
In “Short Notes,” p. 122, Lieut. G. Mackinlay, E.A., describes an ingenious 
contrivance for finding the distances of ships at sea from elevated coast batteries. 
When the battery is at only a moderate height above the sea it is necessary not 
only to measure the angle of depression with great accuracy, but to allow for the 
rise and fall of the tide; and in this case the scale which Lieut. Mackinlay proposes 
to use in conjunction with Bell’s hydroscope would undoubtedly be most useful. 
But if the elevation of the battery is considerable (as is the case with several of 
those at Gibraltar and St. Helena), the rough instrument of which an account was 
given in “ Proceedings, B.A. Institution,” Yol. YI. p. 7, is sufficiently accurate 
for all practical purposes, and has the additional advantages of being extremely 
18 
