Cammell 
6-in. plate, 
1897. 
Vickers 6 
inch plate 
1897. 
510 THE DEVELOPMENT OF ARMOUR. 
probable. It is difficult to convert the blow of a shot into movement 
of a large mass., but when once the mass is in sudden motion, it seems 
rather guess work to say what will stop it. 
On September 22nd, 1896, a Harveyed nickel steel plate made by 
Messrs. Cammell was subjected to the new test of fire 6 in. Holtzer 
shot delivered with 1,960 f.s. striking velocity and 2,665 ft.-tonsenergy 
and 13*45 perforation of iron establishing a figure of merit, 
2*24, which is very good. The back showed slight bulges 
with openings commencing in the centre. In March a Brown's 
plate behaved very similarly and a Vicker's plate made by the Krupp 
' process as worked out by Yickers was tested with admirable results in 
’ March, 1897 (see Figs. 16 and 17). At the request of the makers a 
Fig . 16. 
