406 



KEPORT 1866. 



Table II. — Abstract showing the results of the experiments carried out at 

 Shoeburyness, 22nd March, 1865, against 5-5-inch unbacked plates. 1000 

 to 1010 shoAV effect of equality of vis viva where V and W vary. In the 

 last three rounds the eifects are not comparable : — • 



35-lb. shot, spherical, length 6-220 ~ 

 63-lb. shot, elongated, length 8-500 

 70-lb. shot, elongated, length 9-315 

 106-lb. shot, elongated, length 13-458 _ 



hemispherical- headed . 



If we consider this Table, it appears that numbers 1000, 1001, 1002, 1003, 

 1006, and 1007 all passed through the plates, and to about the same deptli 

 in the earth behind, which is a rough indication of their possessing the same 

 remaining " work." These eft'ccts were produced by projectiles of various 

 weights, the difterence being verj' considerable; but the velocities were so 

 arranged that the expression Wy" was nearly a constant. Thus No. 1000, 

 consisting of a spherical shot of 35-9 lbs., with velocity of 1920 feet, and 

 " work" of 917 foot-tons passed through the plate, and subsequently pene- 

 trated 3 feet 2 inches into earth. No. 1002, consisting of an elongated steel 

 shot of 106-6 lbs., mth velocity of 1110 feet, and "M'ork" 911 foot-ton.s, 

 also penetrated the plate, and subsequently 3 feet 3 inches into earth. The 

 difference between W and v in this instance is very marked, and the " work " 

 done is the same. 



■ Earth loosened by a former shot. 



