ARMOUR-PIERCING PROJECTILES. 
503 
Revue d'Artillerie, July 1878, p. 380 , 
HOLLAND.—Practice against Armour Plates of different 
kinds. 
The naval service of Holland carried out during tlie months of 
August and September., 1877^ some interesting experiments against 
armour plates submitted as samples by different manufacturers. 
There were altogether six plates—two descriptions from the French 
factory of Marrel, two from Duus (agent to the Swedish factory of 
Sandvik), and one from each of the English companies, Cammell & Co., 
and Brown & Co. 
Their dimensions are as follows :— 
Height. Width. Thickness, 
metres, ft. metres, ft. metres, ins. 
Marrel. 2*65 (8-694) ... 0*91 (2*985) ... 0*254 (10) 
Cammell... 2*75 (9*022) ... * ... 0*255 (9*921) 
Brown. « ... « ... 0*250 (9*842) 
Duus . a ... u ... 0*234 (9*218) 
The plates of Duus were of steel, and the remainder of wrought-iron. 
They were arranged as follows 
Three plates—those of Crammell, Marrel, and Duus—were placed 
with their longest sides vertical, and the three others, of Brown, Marrel, 
and Duus, with their longest sides horizontal, against a teak backing. 
The horizontal plates were slightly curved, to the extent of about 12 cm 
(4*724 ins.) 
The vertical plates were supported by two layers of timber placed 
horizontally and vertically, the thicknesses being respectively 31*5 cni 
(12*402 ins.) and 30*5 cm (12*008 ins.), and supported behind by five 
horizontal balks of 20*5 cm (8*071 ins.), and four vertical balks of 39*5 CItl 
(15*551 ins.). This target was solidly attached on board a vessel. 
On the centre of each plate a white bulks eye was painted 200 mm 
(7*874 ins.) in diameter. 
