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2. Swivel (drill rig) - Wikipedia

   en.wikipedia.org/wiki/Swivel_(drill_rig)

   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 ...

3. List of components of oil drilling rigs - Wikipedia

   en.wikipedia.org/wiki/List_of_components_of_oil...

   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 ...

4. Bottom hole assembly - Wikipedia

   en.wikipedia.org/wiki/Bottom_hole_assembly

   Rotary assemblies [2] are commonly used where formations are predictable and the rig economics are an issue. In such an assembly the weight of the drill collars gives the BHA the tendency to sag or flex to the low side of the hole, collar stiffness length and stabiliser diameter and placement are engineered as a means of controlling the flex of the BHA.

5. Combination gun - Wikipedia

   en.wikipedia.org/wiki/Combination_gun

   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]

6. Swivel chair - Wikipedia

   en.wikipedia.org/wiki/Swivel_chair

   A swivel, swivelling, spinny, or revolving chair is a chair with a single central leg that allows the seat to rotate 360 degrees to the left or right. A concept of a rotating chair with swivel castors was illustrated by the Nuremberg noble Martin Löffelholz von Kolberg in his 1505 technological illuminated manuscript , the so-called Codex ...

7. Avro Lincoln - Wikipedia

   en.wikipedia.org/wiki/Avro_Lincoln

   The Avro Type 694 Lincoln is a British four-engined heavy bomber, which first flew on 9 June 1944. Developed from the Avro Lancaster, the first Lincoln variants were initially known as the Lancaster IV and V; these were renamed Lincoln I and II. It was the 2nd to last piston-engined bomber operated by the Royal Air Force (RAF).