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    • Plaque on brick wall of the British imperial standards of length
    Rights: Marc Görtz Published 17 August 2011 Size: 78 KB Referencing Hub media

    This plaque shows British imperial standards of length. The plaque was mounted outside the Royal Greenwich Observatory in 1866. The public used the standards to check the accuracy of their rulers.

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      ARTICLE

      Measurement systems

      To measure the quantity of anything, we need a comparison with some precise unit value. Early humans used body parts and natural surroundings to provide suitable measuring instruments ...

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