PROCEEDINGS OF THE POLYTECHNIC ASSOCIATION. 559 



shell, which ranging somewhat further than the others, hit the tar- 

 get, and hurst as usual.' These shots were thrown from a gun 

 weighing 560 pounds, at an elevation of six degrees, with ten 

 ounces of powder, the shot weighing five pounds. Another of 

 his guns, five inches in diameter, at five degrees elevation, and 

 with ten pounds of powder, threw a ball weighing 80 pounds 2,0^4 

 yards. 



" With my system, as is stated in the official report above 

 referred to, by the use of an ordinary six-pounder bronze gun, of 

 the service pattern, weighing 889 pounds, which had undergone 

 no other change than rifling, with powder charge of one pound 

 and a half, at an elevation of five degrees, a projectile weighing 

 14 pounds was thrown 1,984 yards. And with the ordinary ser- 

 vice pattern of the cast-iron seacoast 42-pounder gun, seven 

 inches ia diameter, at an elevation of five degrees, and a powder 

 charge of ten and a half pounds, a shot weighing eighty-one 

 pounds one and a half ounces was thrown 2,221 yards. 



" It will thus be seen, that with the ordinary six-pounder gun, 

 much shorter in length of bore than the Armstrong gun, a ball 

 more than three times the area of the Armstrong ball, and con- 

 sequently displacing more than three times the atmospheric air, 

 and meeting more than three times the resistance, and nearly 

 three times as heavy, was thrown by my plan from a gun not 

 twice as heavy as Armstrong's, with less than three times as 

 much powder, and with one degree less of elevation, 20 yards 

 further ! ! 



" It will also be seen, that with the ordinary cast-iron seacoast 

 42-pounder gun, seven inches in diameter, at an elevation of five 

 degrees, with powder charge of ten and a half pounds, a shot 

 weighing eighty-one pounds one and a half ounces was thrown 

 2,221 yards — or, in other words, a projectile heavier than its 

 Armstrong rival, with an area twice as large, and displacing 

 twice as much atmospheric air, and meeting with twice as much 

 resistance, with an excess of powder charge of only eight ounces, 

 and at the some elevation, was thrown 147 ySiYds further. 



" This comparison between established facts on one side and 

 the inventor's claim on the other, needs no comment. 



JYote 3. — " Extracts from the report of the Board of Ordnance 

 officers, appointed by the War Department, July 1, 1860, by Spe- 

 cial order No. 44 :• 



