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A minute wheel whose pinion drives the hour wheel. During setting it is driven by the intermediate wheel in the keyless works and it turns both the cannon pinion and the hour wheel, moving the hands. An hour wheel which fits over the shaft of the cannon pinion and whose shaft holds the hour hand. The hour wheel rotates once for every 12 ...
The cannon pinion drives a small 12-to-1 reduction gearing called the motion work that turns the hour wheel and hand once for every 12 revolutions of the minute hand. For the same rate of oscillation, the duration of run, runtime or power reserve of a mechanical watch is mainly a question of what size of mainspring is used, which is, in turn, a ...
16th-century depiction of a cannon with trunnions With the creation of larger and more powerful siege guns in the early 15th century, a new way of mounting them became necessary. Stouter gun carriages were created with reinforced wheels, axles, and “trails” which extended behind the gun.
The M61 Vulcan is a hydraulically, electrically, or pneumatically driven, six-barrel, air-cooled, electrically fired Gatling-style rotary cannon which fires 20 mm × 102 mm (0.787 in × 4.016 in) rounds at an extremely high rate (typically 6,000 rounds per minute).
The 2S7 Pion ("peony") or 2S7M Malka is a Soviet self-propelled 203 mm cannon. "2S7" is its GRAU designation. More than 250 units were built; some sources say 500, [ 1 ] others up to 1,000. [ 4 ] They were distributed around the former Soviet states during the dissolution of the Soviet Union in 1991.
A safety pinion was an alternate means of protection, used with the going barrel. In this, the center wheel pinion, which the barrel gear engages, was attached to its shaft with a reverse screw thread. If the spring broke, the reverse recoil of the barrel, instead of being passed on to the gear train, would simply unscrew the pinion.
The cannon is a larger and more modern version of the 35 mm Bushmaster III chain gun, which itself is a larger version of the 25 mm M242 Bushmaster cannon. Although its shells, 50 x 228 mm, are twice the diameter of the 25×137mm cartridge of the M242, the 50mm cannon is not much longer than the smaller weapon. [ 2 ]
Spiking a gun was a method of temporarily disabling a cannon by hammering a barbed steel spike into the touch hole; this could be removed only with great difficulty. If a special spike was unavailable, spiking could be done by driving a bayonet into the touch-hole and breaking it off, to leave the blade's tip embedded. [2]
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