Testing the Value of Guns by Firing under Water. 175 



the proper point for measurement. In the cartridge for the 

 Spanish Model, the measurement must be from that point of 

 the case just before it becomes bevelled to a smaller circum- 

 ference. Regarding these points, we find from the above 

 illustrations that the case of the TJ. S. Army cartridge is 2-32= 

 1-16 inch less than the U. S. Model, and in the cartridge for the 

 Spanish Model the point of measurement is 6-32=3-16 inches 

 less than that of the IT. S. Model. The proper correction 

 then to make for the U. S. Army rifle, is 4 inches (39 1-8 — 

 35 1-8) for the barrel and 1-16 inch for the case, or in all 4 1-16 

 inches. For the Sharp's rifle, 5 inches (35 1 8—30 1-8) is the 

 total correction, as the same cartridge is used for the U. S. 

 Model. 



For the Spanish Rifle, the barrel being the same as that of 

 the U. S. Model, the only correction will be for the cartridge, 

 or 3-16 inch — total correction. Making the above correc- 

 tions in the results obtained with equal weight of powder and 

 bullet for each rifle, measured from the mouth or nozzle of the 

 gun, we obtain the true relation of one rifle to another, which 

 will at once be seen to be quite different from the first re- 

 sults. 



TABLE No. 14. 



RIFLE. 



FIEST DISTANCE. 



CORRECTED DISTANCE. 



REMARKS. 



TJ. S. Army Bine 



3 ft. 9% inches 



3 ft. 9?4 " 



4 ft. 1^ " 

 4ft.lM " 

 4 ft. 1^ " 

 4 ft. IM " 

 3 ft. 10 

 3ft.lOM " 



4 ft. 1 11-16 inches 



4 ft 1 13-16 " 



4 ft. 1^ 



4 ft 1% 



3 ft. 8% 



3 ft. 8% 



3 ft. 10 3-16 " 



3 ft. 10 T-16 " 



Board was penetrated 





U. S. Model Eifle 









Sharp's Eifle 



Board was penetrated 





*Spanish Model 



Board was penetrated 



* << << 







* The powder in this case was 72—73 grains; bullet 384—388 grains 



By examining the corrected results in the third column of 

 the above table, it will be seen that the U. 8. Army rifle is 

 superior, by 3-16 inch, to the U. S. Model rifle; and that this 

 latter is 5 inches superior to the Sharp's rifle. Calculating 

 for each rifle at what distance a board would be penetrated if 

 the bullet passed through air instead of water, we find : 



