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  2. Chamfer - Wikipedia

    en.wikipedia.org/wiki/Chamfer

    In machining a chamfer is a slope cut at any right-angled edge of a workpiece, e.g. holes; the ends of rods, bolts, and pins; the corners of the long-edges of plates; any other place where two surfaces meet at a sharp angle. Chamfering eases assembly, e.g. the insertion of bolts into holes, or nuts.

  3. Jones calculus - Wikipedia

    en.wikipedia.org/wiki/Jones_calculus

    Plates made of these materials for this purpose are referred to as waveplates. Uniaxial crystals have one crystal axis that is different from the other two crystal axes (i.e., n i ≠ n j = n k). This unique axis is called the extraordinary axis and is also referred to as the optic axis. An optic axis can be the fast or the slow axis for the ...

  4. Panama Canal - Wikipedia

    en.wikipedia.org/wiki/Panama_Canal

    A compromise was made and the locks were built 33.53 m (110.0 ft) wide. Each lock is 320 m (1,050 ft) long, with the walls ranging in thickness from 15 m (49 ft) at the base to 3 m (9.8 ft) at the top. The central wall between the parallel locks at Gatun is 18 m (59 ft) thick and over 24 m (79 ft) high.

  5. Celsius - Wikipedia

    en.wikipedia.org/wiki/Celsius

    Anders Celsius's original thermometer used a reversed scale, with 100 as the freezing point and 0 as the boiling point of water.. In 1742, Swedish astronomer Anders Celsius (1701–1744) created a temperature scale that was the reverse of the scale now known as "Celsius": 0 represented the boiling point of water, while 100 represented the freezing point of water. [5]

  6. Tenerife - Wikipedia

    en.wikipedia.org/wiki/Tenerife

    Tenerife (/ ˌ t ɛ n ə ˈ r iː f / TEN-ə-REEF; Spanish: [teneˈɾife] ⓘ; formerly spelled Teneriffe) is the largest and most populous island of the Canary Islands. [4] It is home to 42.9% of the total population of the archipelago. [4]

  7. Big Ben - Wikipedia

    en.wikipedia.org/wiki/Big_Ben

    23 September 1936: A painter painting the inside of the clock room placed a ladder against a shaft driving the hands, stopping the clock from 8:47 a.m. to 10:00 a.m. [51] 1 September 1939: Although the bells continued to ring, the clock faces were not illuminated at night throughout World War II to avoid guiding bomber pilots during the Blitz.

  8. Berlin Wall - Wikipedia

    en.wikipedia.org/wiki/Berlin_Wall

    The "fourth-generation Wall", known officially as "Stützwandelement UL 12.11" (retaining wall element UL 12.11), was the final and most sophisticated version of the Wall. Begun in 1975 [ 80 ] and completed about 1980, [ 81 ] it was constructed from 45,000 separate sections of reinforced concrete, each 3.6 metres (12 ft) high and 1.2 m (3.9 ft ...

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