1892.] 



by Friction in the Bores of Rifted Guns. 



413 



used being novel, for this investigation, as well as for other purposes, 

 I have recently determined by direct experiments in the bore of a 

 12-cm. quick-firing gun the mean velocities and mean gaseous 

 pressures at all points of the bore, both for the amide powder, mainly 

 used in this investigation, and for cordite. 



Velocity 



tamed t 7 tare 



tn yurt HJ actuc 



otrserv ttton, wt 



of ft at Pouid r and i 



Table II. Uniform Rifling, Amide Powder. 



