669 
EXPERIMENTS CARRIED OUT BY IIERR KRUPP AT MEPPEN, 
27th 'February and 5th March, 1880. 
COMMUNICATED BY 
MAJOR C. H. FAIRFAX ELLIS, R.A. 
(From the Keport issued by Serb Krupp.) 
Continuation of Experiments with 15 cm Gun, 28 Calibres long* 
Trial of Armour Plates at Angles of 90° and 55°. 
Tire experiments begun on the 18th November, 1879, with 15 cni 
gun, No. 283, were continued. 
On the 27th February, 1880, a steel shell, 3J calibres long, was 
fired direct at a 12-inch wrought-iron plate, and two similar shells at 
an 8-inch wrought-iron plate, at an angle of 55°. 
On the 5th March, 1880, a steel shell, 2*8 calibres long, which had 
been put on one side as somewhat too soft, was fired at a wrought-iron 
8-inch plate at an angle of 55°. 
The charge for all four rounds was 37’48 lb. of 7 hole prismatic 
powder of 1*75 density. The results are given in the table. They 
show that,— 
1. In direct impact, the 3| calibre Krupp steel shell, (like the 
2*8 calibre steel shells in the experiment of the 18th November, 1879) 
did not break up, and was hardly at all deformed, notwithstanding the 
high striking energy of 2,308 ft. tons. 
2. The 15 cm steel break up on striking an 8-inch plate, at an angle 
of 55°, with an energy of 2,300 ft. tons. 
In another experiment, a 17 cm Krupp steel shell completely perforated 
a 6-inch plate with strong backing, at a striking angle of 55°, and with 
an energy per inch circumference of 5,921 ft. tons. 
Further experiments will show if it be possible to increase the 
stability of the steel shells. 
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