Sometimes I find interesting things while working in  the Nijmegen Archive. In 1902 a swimming pool was build in Nijmegen measuring 30.5 m by 11.8 m. Today all swimming pools are built to metric standards. The measurements of that pool built in 1902 are almost certainly converted from foot/yard: 100 feet by 12 yards!
Speed skating, today metric only, used yards and miles in that period as well.
These are examples of the stumbling blocks to world metrication if the superpower of the time - then the British Empire -  does not take part in it.
 
Han
 

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