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  2. Twopence (British pre-decimal coin) - Wikipedia

    en.wikipedia.org/wiki/Twopence_(British_pre...

    [citation needed] It may relate to the smallness of the coin – the small coin used as Maundy money after the 1820s. It may also relate to its relative rarity, being produced initially in 1797 as a very large "cartwheel" copper coin and thereafter only as Maundy money as a rare and very small silver coin, largely given away only by the monarch.

  3. History of the British penny (1714–1901) - Wikipedia

    en.wikipedia.org/wiki/History_of_the_British...

    The obverse of the cartwheel coinage is a laureated right-facing bust of George III, with the inscription GEORGIUS III D G REX, [f] while the reverse showed Britannia seated on a rock, facing left, holding an olive branch and trident with the inscription BRITANNIA 1797. [14]

  4. Soho Mint - Wikipedia

    en.wikipedia.org/wiki/Soho_Mint

    These coins were comparatively large, having a broad raised rim with the inscription pressed below the surface and became known as the cartwheel pennies. Over 45 million were struck in two years. [7] The new copper coins were issued at the Soho Mint and by Charlotte Matthews in London who was the banker and business advisor to Watt and Boulton. [8]

  5. Cartwheel - Wikipedia

    en.wikipedia.org/wiki/Cartwheel

    Cartwheel, nickname for some Hanoverian-era British coins; Cartwheel, slang term for a silver dollar coin (United States)

  6. Penny (British pre-decimal coin) - Wikipedia

    en.wikipedia.org/wiki/Penny_(British_pre-decimal...

    The British pre-decimal penny was a denomination of sterling coinage worth 1 ⁄ 240 of one pound or 1 ⁄ 12 of one shilling.Its symbol was d, from the Roman denarius.It was a continuation of the earlier English penny, and in Scotland it had the same monetary value as one pre-1707 Scottish shilling.

  7. Coin rotation paradox - Wikipedia

    en.wikipedia.org/wiki/Coin_rotation_paradox

    The outer coin makes two rotations rolling once around the inner coin. The path of a single point on the edge of the moving coin is a cardioid.. The coin rotation paradox is the counter-intuitive math problem that, when one coin is rolled around the rim of another coin of equal size, the moving coin completes not one but two full rotations after going all the way around the stationary coin ...

  8. Wagon-wheel effect - Wikipedia

    en.wikipedia.org/wiki/Wagon-wheel_effect

    The wagon-wheel effect (alternatively called stagecoach-wheel effect) is an optical illusion in which a spoked wheel appears to rotate differently from its true rotation. The wheel can appear to rotate more slowly than the true rotation, it can appear stationary, or it can appear to rotate in the opposite direction from the true rotation ...

  9. Penny - Wikipedia

    en.wikipedia.org/wiki/Penny

    Penny is first attested in a 1394 Scots text, [n 1] a variant of Old English peni, a development of numerous variations including pennig, penning, and pending. [n 2] The etymology of the term "penny" is uncertain, although cognates are common across almost all Germanic languages [n 3] and suggest a base *pan-, *pann-, or *pand-with the individualizing suffix -ing.