Pont, and is known asbrown prismatic or cocoapowder from its color.Every grain has the formof a right prism with ahexagonal base and a quar-ter inch hole in the axis,the object of the hole beingto allow ignition in thecenter and thus cause thegrain to burn with an in-creasing surface for… … THE SIX INCH CAST STEEL BREECH LOADIlfG RIFLE BEFORE THE TRIAL. built-up 6 inch guns of the navy. From previousrecords of firings with this powder, this charge of48^ pounds could be depended on to give a muzzlevelocity to the projectile of 2,000 feet per second, witha pressure on the walls of the…
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