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A Swivel is a mechanical device used on a drilling rig that hangs directly under the traveling block and directly above the kelly drive, that provides the ability for the kelly (and subsequently the drill string) to rotate while allowing the traveling block to remain in a stationary rotational position (yet allow vertical movement up and down the derrick) while simultaneously allowing the ...
Drill bit (#26) is a device attached to the end of the drill string that breaks apart the rock being drilled. It contains jets through which the drilling fluid exits. Drill floor (#21) is the area on the rig where the tools are located to make the connections of the drill pipe, bottom hole assembly, tools and bit. It is considered the main area ...
The earliest combination guns were called swivel guns, (not to be confused with the more widely known small cannon that is mounted on a swiveling stand or fork and allows a wide range of motion) which used a set of barrels designed to rotate to allow either the rifled or the smoothbore barrel to line up with a flintlock mechanism before firing. [2]
A swivel gun (or simply swivel) [1] is a small cannon mounted on a swiveling stand or fork which allows a very wide arc of movement. Another type of firearm referred to as a swivel gun was an early flintlock combination gun with two barrels that rotated along their axes to allow the shooter to switch between either the rifled or the smoothbore ...
Team of Rivals: The Political Genius of Abraham Lincoln is a 2005 book by Pulitzer Prize-winning American historian Doris Kearns Goodwin, published by Simon & Schuster.The book is a biographical portrait of U.S. President Abraham Lincoln and some of the men who served with him in his cabinet from 1861 to 1865.
The M30 Luftwaffe Drilling ("triple") was a survival weapon issued to Luftwaffe pilots during World War II.It was used by airmen operating in Northern Africa.The M30 was intended to be used for hunting and self-defense against a variety of natural predators.
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