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  2. Banknotes of the pound sterling - Wikipedia

    en.wikipedia.org/wiki/Banknotes_of_the_pound...

    [128] [129] In June 2013 the bank issued a new series of £10 and £20 notes bearing the new brand name; at the same time it also announced that it would cease production of £50 and £100 notes. Older notes bearing the Northern Bank name will continue in circulation for some time as they are gradually withdrawn, and remain acceptable forms of ...

  3. Pound sterling - Wikipedia

    en.wikipedia.org/wiki/Pound_sterling

    Until 1800, these circulated at a rate of 4/9d for 8 reales. After 1800, a rate of 5/– for 8 reales was used. After 1800, a rate of 5/– for 8 reales was used. The Bank then issued silver tokens for 5/– (struck over Spanish dollars) in 1804, followed by tokens for 1/6 d and 3/– between 1811 and 1816.

  4. File:HP-10C programmable calculator.jpg - Wikipedia

    en.wikipedia.org/wiki/File:HP-10C_programmable...

    What links here; Upload file; Special pages; Printable version; Page information; Get shortened URL; Download QR code

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  6. Banknote - Wikipedia

    en.wikipedia.org/wiki/Banknote

    This made counterfeiting bank notes harder still, at least in the short term, and in 1803 the number of forged bank notes fell to just 3000, compared to 5000 the previous year. [16] Banks asked skilled engravers and artists to help them make their notes more difficult to counterfeit during the same time period, which historians refer to as "the ...

  7. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property.

  8. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    All of the logic functions of a calculator had been squeezed into the first "calculator on a chip" integrated circuits (ICs) in 1971, but this was leading edge technology of the time and yields were low and costs were high. Many calculators continued to use two or more ICs, especially the scientific and the programmable ones, into the late 1970s.

  9. Difference engine - Wikipedia

    en.wikipedia.org/wiki/Difference_engine

    A difference engine is an automatic mechanical calculator designed to tabulate polynomial functions. It was designed in the 1820s, and was first created by Charles Babbage . The name difference engine is derived from the method of finite differences , a way to interpolate or tabulate functions by using a small set of polynomial co-efficients.