Annual Report of the Secretary of War

45 INCH 52 Feet arsenal ball barrels blank cartridges bore bottom breech Burst on striking cake caliber 45 carriage cast center of impact chamber Chief of Ordnance compression copper density diameter Direct Hits distance experiments Frankford Arsenal front of target GATLING GUN grains granulation grooves gun-metal gunpowder Hits in Target holes horizontal Hotchkiss revolving cannon iron June 11 length lever lower machine manufacture meal powder means mercury metal mold Moline muzzle niter number of hits Number of Rounds obtained Ordnance Department oscillating ounces paces in front pieces piezometer pipe piston placed Plate Pont's hexagonal pounds pressure pump rear revolutions per minute rods rollers Rounds Fired saltpeter Sandy Hook screw shaft shell shot side specific gravity Springfield Springfield rifle Spruce Boards square inch steel striking ground surface TARGET RECORD temperature Total number trial trunnions tube upper vertical wrought-iron Yards from Gun