Units of measurement by country | Customary units of measurement
The Danes started with a system of units based on a Greek pous ("foot") of 308.4 millimetres (1.012 ft) which they picked up through trade in the late Bronze Age/early Iron Age. Some early standards of measure can be recovered from measured drawings made of the 52.5-foot-long (16.0 m) Hjortspring boat, which though dating to the early Iron Age exemplifies plank-built vessels of the late Bronze Age and the 82-foot-long (25 m) Nydam ship. Thwarts are typically spaced about 3 fod apart. King Christian V of Denmark introduced an office to oversee weights and measures, a justervæsen. This was first led by the royal mathematician Ole Rømer, who established a national system of weights and measures on May 1st, 1683. Rømer's system, which he updated in 1698, was based on the Rhine foot. Its definitions included the following: * the Danish mile as 24,000 Rhineland feet (i.e. 4 minutes of arc latitude) * the Danish pound (pund) as 1⁄62 of the weight of a cubic Rhineland foot of water (499.7 g) * the Danish ell (alen) as 2 Rhineland feet (630 mm) Rømer also suggested a pendulum definition for the foot (although this would not be implemented until after his death), and invented an early temperature scale. The metric system was introduced in 1907. (Wikipedia).
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