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41Drilling 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… …
42Arctic Regions — ▪ 2009 The Arctic regions may be defined in physical terms (astronomical [north of the Arctic Circle, latitude 66° 30′ N], climatic [above the 10 °C (50 °F) July isotherm], or vegetational [above the northern limit of the tree line]) or in human… …
43line — n. long, thin mark 1) to draw a line 2) a broken; contour; crooked; curved; dotted; fine, thin; heavy, thick; horizontal; parallel; perpendicular; solid, unbroken; straight; vertical; wavy line queue (AE) 3) to form a line 4) to buck ( push into… …
44May 2010 — was the fifth month of that year. It began on a Saturday and ended after 31 days on a Monday. International holidays (See Holidays and observances, on sidebar at right, below) Portal:Current events This is an archived version of Wikipedia s… …
45Snowdon Mountain Railway — Rheilffordd yr Wyddfa Half way up the Mountain Overview …
46Dates of 2004 — ▪ 2005 January It turns out we were all wrong, probably, in my judgment. David Kay, former U.S. chief weapons inspector in Iraq, in testimony to the U.S. Senate Armed Services Committee, January 28 January 1 Haitian Pres. Jean… …
47Boiler — For the Limp Bizkit song, see Boiler (song). A portable boiler (preserved, Poland) …
48Sand casting — Sand casting, also known as sand molded casting, is a metal casting process characterized by using sand as the mold material. It is relatively cheap and sufficiently refractory even for steel foundry use. A suitable bonding agent (usually clay)… …
49Vladimir Shukhov — Vladimir Grigoryevich Shukhov ( ru. Владимир Григорьевич Шухов), (OldStyleDate|August 28|1853|August 16 February 2 1939) was a Russian engineer polymath, scientist and architect renowned for his pioneering works on new methods of analysis for… …
50Rationing — Gasoline ration stamps printed, but not used, as a result of the 1973 oil crisis Rationing is the controlled distribution of scarce resources, goods, or services. Rationing controls the size of the ration, one s allotted portion of the resources… …
