INDEX 
Abel, Mr., on a curious instance of electro¬ 
lytic action, 320 
Abstract of effect against the wall of a fortress 
according to Carnot’s plan, 240 
--shewing mean initial velocities of service 
and experimental projectiles, 11 
Abstracts of proceedings, R.A.I., 53, 271 
Alphabetical list of members, R.A.I., 292 
American guns, velocities of, 72 
Analysis of Austrian gun cotton, 371 
Anderson, Mr, experiments made to test 
various forms of rifling, 263 ;—experiments 
with “ sterro-metal,” 265 
Angle of departure, definition of, 27 
- of descent, definition, of, 28 
• -of elevation, definition of, 27 
■ -of inclination, ib. 
■ -of projection and trajectories of the 
12-pr. Armstrong projectiles, 130 
Angles of rifling of competitive guns, 333 
Annual Reports R.A.I., 53, 271 
Approximate elevations necessary to pitch an 
Armstrong shot or shell into a work at the 
distances specified, and with the charges 
given, 251 
Approximate angles of elevation and times of 
flight due to short distances when the angle 
of descent is required to be not less than 10°, 
252 
Armour plates, cost per ton, 32; qualities 
necessary in, 34 
Armstrong rifle guns, mean deflections of, 25, 
26 
• -120 shunt gun, effect of, against Thorney- 
croft’s iron bars, 32 
——guns employed in ricochet fire, 246;— 
results of practice with, 249 
• -projectiles, comparison of first and second 
grazes of ricochet fire, 250 
• -600-pr. shunt rifle gun, preliminary trial 
of, 419;—general description of, and pro¬ 
jectiles used with, 419,420;—initial veloci¬ 
ties of, 421 
Arrangements at Shoeburyness, for carrying 
on experiments with Navez’s apparatus, 160 
Atmospheric pressure upon phenomena of 
combustion, 14 
Balance sheets of accounts of R.A.I., 55, 273 
Ballistic coefficient C for English smooth-bore 
projectiles, value of, 165;—for rifled pro¬ 
jectiles, 166 
Barometrical readings, of various experiments 
to ascertain the initial velocities of different 
projectiles, 132-144 
Bearers, for shot, of Armstrong 600-pr. shunt 
rifle gun, 421 
Belgian experiments on the proof of gun¬ 
powder, 110 
“Black Prince,” orders for construction of, 
30 
Boxer, Bt.-Col., on the system of ordnance 
calculated to prove the most efficient against 
iron clad ships and batteries 47;—on perma¬ 
nent forts and moveable floating batteries, 93 
Breaching unseen defences, 231;—experiments 
with two brass rifled 12-prs., in, 237;—with 
four iron rifled 12-prs., 238;—with two 
brass and four iron 12-prs., ib. 
Bridges in New Brunswick, 189 
Brown and Co., Messrs, armour plates rolled 
by, for “Committee” target, 44. 
Bruce, Captain, account of experiments 
against iron plates at Shoeburyness, fur¬ 
nished by, 89;—against Mr Scott Russell’s 
and Mr Samuda’s targets, 99;—to determine 
the resisting powers of the “Minotaur” 
class of men-of-war, 103;—with Whitworth’s 
projectiles, fired from the same guns as those 
used during former experiments, 174;—• 
against a shield constructed on the principle 
proposed by Captain Inglis, 224;-—continued, 
on Capt. Inglis’s second shield, 253;—to 
test three rolled armour plates, supplied by 
Messrs Brown and Co. of Sheffield, 256 ;— 
against a target proposed by Mr Chalmers, 
and constructed at the Millwall ironworks, 
316 ;—preliminary trial of a 600-pr. 13‘3 in. 
M. L. wrouglit-iron, 10 grooved shunt Arm¬ 
strong rifle gun, 419. 
Bursting charges, of competitive guns, 336 
Cahots, mode of mending, 189 
Canadian sleds, description of, 181 
Carnot wall, report of practice against a, 242 
Cast-iron cylinders, rifled on various systems, 
264 
Charcoal iron, 340 
Classification and passing of French metal, 79 
Clerk, Lt.-Col., on change of form assumed by 
metals when heated and then cooled, 303 
Coast batteries, 223 
Coles, Captain, cupola of, 107 
Combustibles, rate of burning of, 14 
Combustion of gun cotton and gunpowder, 
treatise on, by Lt. Karolyi, 383 
Committee, R.A.I., members of, 283 
“Committee” target,experiments to determine 
the utility of wooden backing, 45 
Comparative practice with a rifled (Britten’s) 
and a smooth-bored 32-pr. gun, 337 
-velocities of the same shell fired from 
rifled and smooth-bored 32-prs. of 58 cwt., 
128 
Comparison of accuracy, of competitive guns, 
335 
■-of first and second grazes, of Armstrong 
projectiles in ricochet fire, 250 
Competitive rifled cast-iron guns, report of, 
323 ;—dimensions and weights of, 331;— 
concluding trial of, 365;—particulars of the 
projectiles employed in each system, 366 
