85 
RECENT DEVELOPMENT OE ARMOUR AND ITS 
ATTACK BY ORDNANCE. 
BY 
CAPTAIN C. ORDE BROWNE, late R.A. 
On August 4th, 1892, at Shoeburyness, was tested an Ellis-Tresidder ama-Tresid. 
plate, 1 8 feet x 6 feet X 10 inches, weighing about 8*56 tons. Five de 1 r 8 |^ te 
6-inch Holtzer steel projectiles (weighing about 100*7 lbs. each) were 
fired at it, with a striking velocity of about 1950 f.s., total energy of each 
2655 foot-tons, and energy per ton of plate 310 foot-tons, calculated 
perforation 12*4 inches of iron or 9*95 inches of steel. Figs. 15, 16, 
and 17, show the front, back, and edge view of this plate. It may be 
Fig. 15. 
1 Sec “ Engincoi’,” September IGtli, 1802. 
2. VOL. XX, 
12 
