LIST OF PLATES. 
PAGE 
The Densimeter . 54 
Plates I., II., III., and IV., illustrating Captain J. P. Morgan’s Paper, “ A 
Proposal for a Very Heavy Breech-Loading Gun”.. 164 
Camel Guns . 166 
Axle-Tree Seats for Sir W. Armstrong’s 12-pr. gun of 8 cwt., as designed 
by Captain H. L. Balfour, R.A... 170 
Mallet’s 36-inch Mortar, Front elevation . 203 
do. do. Section . 206 
do. do. Lateral elevation.. 212 
Diagram of practice with shells from 36-inch mortar, 1857-8 . 221 
Proposed formation for a brigade of six battalions... 242 
Counter-proposal for formation of the brigade . 243 
Mounting of twelve 12-ton guns at Malta. Plates I., II., III., IV., V., and 
VI. 293 
Figs. 1 to 10, illustrating Captain J. P. Morgan’s Paper on the “ Explosive 
Force of Gunpowder ” 438 
The Clock Signal-Vane . 479 
The Multiplying Alidade, or Practice Register . 483 
Map of country round Aldershot, illustrating the Autumn Manoeuvres of 1871 498 
