line of equal variation of the compass
41soil — soil1 soilless, adj. /soyl/, n. 1. the portion of the earth s surface consisting of disintegrated rock and humus. 2. a particular kind of earth: sandy soil. 3. the ground as producing vegetation or as cultivated for its crops: fertile soil. 4. a… …
42North Australia Air War — North Australian Air War 1942–1943 Part of the Pacific Theater of World War II …
43History of timekeeping devices — For thousands of years, devices have been used to measure and keep track of time. The current sexagesimal system of time measurement dates to approximately 2000 BC, in Sumer. The Ancient Egyptians divided the day into two 12 hour periods, and… …
44isotope — isotopic /uy seuh top ik/, adj. isotopically, adv. /uy seuh tohp /, n. Chem. any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in… …
45Vacuum tube — This article is about the electronic device. For experiments in an evacuated pipe, see free fall. For the transport system, see pneumatic tube. Modern vacuum tubes, mostly miniature style In electronics, a vacuum tube, electron tube (in North… …
462009 NFL season — 2009 National Football League season Regular season Duration September 10, 2009 – January 3, 2010 Playoffs Start date January 9, 2010 AFC Champions Indianapolis Colts NFC Champions …
47calligraphy — calligrapher, calligraphist, n. calligraphic /kal i graf ik/, calligraphical, adj. calligraphically, adv. /keuh lig reuh fee/, n. 1. fancy penmanship, esp. highly decorative handwriting, as with a great many flourishes: She appreciated the… …
48contract — contractee, n. contractible, adj. contractibility, contractibleness, n. contractibly, adv. n., adj., and usu. for v. 16 18, 22, 23 /kon trakt/; otherwise v. /keuhn trakt /, n. 1. an agreement between two or more parties for the doing or not doing …
49Clavier-Übung III — Johann Sebastian Bach, 1746 The Clavier Übung III, sometimes referred to as the German Organ Mass, is a collection of compositions for organ by Johann Sebastian Bach, started in 1735–6 and published in 1739. It is considered to be Bach s most… …
50Textual criticism — Carmina Cantabrigiensia, Manuscript C, folio 436v, 11th century Textual criticism (or lower criticism) is a branch of literary criticism that is concerned with the identification and removal of transcription errors in the texts of manuscripts.… …
