In this manner each turn of the hand-crank loads one barrel, fires another, whilst the spent cartridge is being extracted from a third. The continuous turning of the hand crank imparts this intermittent rotary motion to the barrels, and they are at rest during the period of loading, firing and extraction. The barrels do not rotate continuously as in the Gatling gun, but make only one-fifth a turn at a time, thus bringing, at each movement, the following barrel into the place occupied by the one before it. There is only one set of mechanism for all the barrels, each barrel being brought successively before the loader, striker and extractor. This group of barrels, bearing at their front end in a gun-metal frame carrying the trunnions, is rotated in front of a fixed breech-block, which contains the mechanism for loading, firing and extracting the spent cartridges. ![]() The Hotchkiss revolving cannon consists of five barrels, mounted parallel to each other, around a common axis, and carried between two gun-metal disks, as in the Gatling gun.
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