Public Standards of Length - Greenwich
 London, Greenwich, Royal Greenwich Observatory by Wikimedia Commons
In 1866, a placard was erected on a wall in Greenwich that showed the precise measurements for a yard, a foot, and an inch. Those wishing to ensure that their measuring sticks were accurate would compare against the public standards and adjust accordingly. These measurements were of paramount importance in the field of construction or in a science lab, where exact length was essential.
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