418 



Capt. Noble. Note on the Energy absorbed [Feb. 4 y 



of energy respectively 38 and 62 ft.-tons, or, expressed in percentages, 

 2'71 per cent, for the uniform rifling and 4'72 per cent, (the highest 

 reached) for the parabolic rifling. 



The value of fi h the coefficient of friction, calculated from the 

 uniform rifling, is 0'359. 



The fifth and sixth series were fired with driving bands of the 

 Government pattern, but with radii successively slightly increased, as 

 shown in the diagrams, and the results are given in the two follow- 

 ing tables. 



Table VI. Results of Experiments with Driving Rings of 

 Section " E." 





