Diagrams, experimental results by Andrew Noble Two diagrams, labelled plates 1-2, of 'curves showing velocity and pressure obtained in bore of 12cm gun by actual observation, with charges of 10.5lbs of amide powder and 5.5lbs of cordite, with a 45lbs projectile' and 'curves showing the pressure existing between thedriving surfaces of grooves and projectile, (A) in a uniform rifling of one turn in 35 calibres, (B) in a parabolic rifling terminating in one turn in 35 calibres, in a 12cm gun, fired with a charge of 10.5lbs of amide powder, and a projectile of 45lb' respectively. Subject: Physics / Ballistics Prints of these diagrams were published in volume 50 of the Proceedings of the Royal Society alongside the paper 'Note on the energy absorbed by friction in the bores of rifled guns'. 1891