508 
DUTCH ARMOUR-PIERCING EXPERIMENTS. 
consisted of a section of our English Bellerophon target, namely, iron 
plate of 6-in. and 8-in. above and below, (as shown in Figs.) on 10-ins. of 
teak, with l|-in. skin. For this, a penetrating figure of 60 ft.-tons per 
inch circumference was found to be sufficient for the upper portion, and 
93 ft.-tons per inch circumference enabled the projectile (shown in 
Fig. 2) to get its point through the inner skin of the lower portion. The 
guns employed were a cast-iron and a steel gun, each of 24 centimetres 
calibre, that is, 9*45-in.; the range was 500 metres (547 yds.) 
The projectiles supplied were as follows: — From Ekman, chilled 
iron (vide Fig. 4) of two sizes, namely, 2*6 calibres long, weighing 
152*34 kilogs. (325*73 lb.), and 2*8 calibres long, weighing 152*34 
kilogs. (335*85 lb.) These were chilled nearly to the centre in the 
head, and the body was left unchilled (vide Fig. 4.) From Gruson, 
chilled iron (vide Fig. 5) of two sizes, namely 2*6 calibres long, 
weighing 149*65 kilogs. (329*93 lb.) and 2*8 calibres long, weighing 
153*85 kilogs. (339*18 lb.) These were chilled to a certain depth 
over both head and body, as shown in Fig. 5. From Krupp, steel } 
28 calibres long, weighing 161 kilogs. (354*94 lb.) 
