(a) Armor-piercing shot. Two capped shot, sandloaded to standard weight, shall be fired against a hard-faced Krupp armor plate from 1 to 1½ calibres thick, secured to a timber backing in a manner satisfactory to the Chief of Ordnance, with about the corresponding velocity given by the following table, with the requirement that the shot shall perforate the plate unbroken and then be in condition for effective bursting.
If both projectiles fulfill the above test, the lot will be accepted.
If, one of the shots fails to pass the test here prescribed, a supplementary test shall be made by firing the third shot under the same conditions as the first two shot; if this passes the test as prescribed above, the lot shall be accepted; if it fails to do this, the lot shall not be accepted.
|
Calibre of shot |
Weight of shot |
Thickness of plate |
Velocity for penetration |
| 4-inch | 33[3] |
{ 4-inch { 5-inch |
1,930 2,295 |
| 4.7-inch | 453 | 5-inch | 2,220 |
| 5-inch | 58 |
{ 5-inch { 6-inch |
2,005 2,320 |
| 6-inch | 106 |
{ 6-inch { 8-inch |
1,950 2,450 |
| 8-inch | 316 |
{ 8-inch { 10-inch |
1,760 2,100 |
| 10-inch | 604 |
{ 10-inch { 12-inch |
1,745 2,020 |
| 12-inch | 1,046 | 12-inch | 1,730 |
[ 3 ] Weight uncapped.
For intermediate thickness the velocity shall be determined by interpolation.
(b) Armor-piercing shell. Two capped shell, sandloaded to standard weight, shall be fired against a hard-faced Harveyized armor plate secure to a timber backing in a manner satisfactory to the Chief of Ordnance, of 3-inches thickness for 5-inch and 6-inch shell, 4-inches for 8-inch shell, 5-inches for 10-inch shell, and 6-inches for 12-inch shell, with a velocity [ 4 ] of about 1,420 f.s. for the 5-inch shell, 1,220 f.s. for the 6-inch shell and 920 f.s. for the 8-inch, 10-inch and 12-inch shell at impact, with the requirement that the shell shall go through the plate unbroken, and then be in a condition for effective bursting.
[ 4 ] The weight of powder charge to give the prescribed velocity will be determined shortly before the test, cast iron projectiles of proper weight being fired for the purpose; this weight of charge will be taken as giving the prescribed velocity to the projectiles undergoing test.