410 



REPORT 18G6. 



Table VI. — Abstract showing the results of experiments carried out against 

 4-5-inch unbacked plates to determine the relative penetrating effect of 

 projectiles of the same diameter and form of head, but so varying in weight 

 and velocity that the vis viva on impact was constant. 



Date of experiment March 13, 1866. Brand of powder, Eifle L G. July 

 8, 1864. Lat. 805. 



s 



C73 





1047* 

 1158 



II59 

 I I 60 



I161 

 I I 62 



1163 

 1164 



I16S 



II66 



1167 



s 

 Z 



lbs. 

 6-69 



663 



6'09 



7-87 

 8-00 



2 6*63 



8-00 



1.1 



■So. 



63-87 lbs. 



8-42 in. 

 63-87 lbs. 



8 42 in. 



70-94 lbs. 



9-3 in. 



jo6-i gibs. 



13-39 in. 



35-50 lbs. 



6-22 in. 

 53-56 lbs 



6-22 in. 



70-94 lbs. 



9-3 in. 

 63-81 lbs. 



8-42 in. 



1-09 106-62 lbs. 

 13-39 in- 



35-50 lbs. 

 622 in. 



o 



feet. 



I12I-2 



O jj 



.H S 

 g a S 



feet. 



II 12-2 



1128-3 III9-3 



1077-7 

 864-1 



1483-6 

 15067 



1069-2 

 II07-I 



861-3 



863-1 



1509-2 



860-5 



1460-0 

 1482-4 



l^§ 



— a 



c a 



Effects with hemispherical-headed steel projec- 

 tiles of 6**22-inch diameter, fired from the 

 service 64-pounder M L. Gun of 6'3-inch 

 calibre. 



8577 



859-5 



1484-9 



547'' 

 554'i 



545 •» 



5247 

 541-8 



1098-2 5336 



543 '9 



546-2 



542-8 



Just penetrated. Shot rebounded about 

 6 yards ; length of shot 8-05 inches. 



Just penetrated ; broke plate behind in 

 the usual manner ; shot rebounded 

 4 feet; length of shot 7-92-inches; 

 diameters of hole 6 X 6-25 inches. 



Miss. Struck support of plate and 

 glanced off into the earthwork. 



Through plate, breaking away rear in 

 the usual manner. Shot fell 2 feet in 

 rear ; length of shot 12-92 inches ; 

 diameters of hole 6-75 X 7-5 inches. 



Stuck in plate, breaking it away behmd ; 

 shot almost through. 



Just penetrated ; broke plate behind in 

 the usual manner ; .shot rebounded 

 4 feet ; diameter of shot 6-32 iuc^.c,^ ; 

 diameters of hole 64 X 6-5 inches. 



Miss. Struck support and glanced into 

 earthwork. 



Almost penetrated ; broke away plate 

 behind over an area of 1 foot by 1 loot. 

 Shot rebounded 5 feet 1) inches. In- 

 dent 4-35 inches; length of shot 7-88 

 inches. 



Stuck in plate, breaking it away at back 

 something more than round 11G4; 

 shot almost through. 



Through plate. Shot turned over and 

 entered earthwork to a depth of 1 

 foot ; length of shot 12-96 inches. 



Made a hole clean through, but shot re- 

 mained sticking in the plate, project- 

 ing as much in rear as in front. 



If we examine this Table, it appears — 



1. That all the projectiles biit one struck with "work" sHghtly under 

 that which was required, viz. 552 foot-tons ; and that 542 tons is only just 

 capable of piercing a 4-5-inch plate. 



Thus, in most instances, the shot, after penetration, rebounded and fell in 

 front of the plate, sho-sving that they had expended almost their entire 

 force in the penetration. 



As 552 tons was calculated on data supplied by a shot (round 1008) 



* Preliminary roimd. 



