circular casing
21Drilling fluid — This article is about fluids used when drilling a well. For fluids used with drill bits during metal working, see cutting fluid. Driller pouring a foaming agent down the rod string on a drilling rig In geotechnical engineering, drilling fluid is… …
22building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …
23Type 72 non-metallic anti-tank mine — Type 72 Non Metallic is a Chinese circular, plastic bodied landmine which is designed to damage or destroy a vehicle by blast effect. Mechanism The mine has a slightly domed pressure plate which is made of flexible plastic with a raised 6 spoke… …
24SR West Country and Battle of Britain Classes — Infobox Locomotive powertype=Steam name = SR Un rebuilt West Country/Battle of Britain Classes Herring, pp. 160 ndash;161] caption = Un rebuilt West Country Class 21C123 Blackmoor Vale , as preserved, in Southern Railway Malachite Green and… …
25List of monsters in Code Lyoko — This is a list of monsters in the French animated television series Code Lyoko . For the most part, the monsters are created by Xana to fight the Lyoko warriors on his behalf. Xana s monsters To defend his towers and to battle the group in Lyoko …
26rotary engine — 1. an engine, as a turbine, in which the impelling fluid produces torque directly rather than by acting upon reciprocating parts. 2. a revolving radial engine. [1810 20] * * * Internal combustion engine in which the combustion chambers and… …
27GBU-39 Small Diameter Bomb — The GBU 39 Small Diameter Bomb (SDB) is a 250 pound (113 kg) guided bomb that is intended to provide aircraft with the ability to carry a higher number of bombs. Most US Air Force aircraft will be able to carry a pack of four of these bombs in… …
28Stage lighting instrument — Stage lighting instruments are used in stage lighting to illuminate theatrical productions, rock concerts and other performances taking place in live performance venues. They are also used to light television studios and sound stages.Terminology… …
29Victory Cross — Cruz de la Victoria Victory Cross (English) Picture of the Santa Cruz de la Victoria. Material Various (incl. gold, gems) …
30Stairway — Stairs redirects here. For other uses, see Stairs (disambiguation). Staircase redirects here. For other uses, see Staircase (disambiguation). This article is about the construction. For the song by Led Zeppelin, see Stairway to Heaven. Stairways… …
