Some years ago I happened to see the programme for a recital to welcome Oslo Cathedral organ back from a major overhaul. The instrument's description gave the voice names in fuss (feet!) – thirds of 'em too, in some cases.
One would think so too. How could you possibly fit "Diapason 2.438m" on a stop-knob, let alone think it would sound better than a "Diapason 8ft"?
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I worked for a while in a sub-contract engineering company and we had drawings in Imperial and others in mm, depending on the customer supplying them. One was German, so the language on the drawings was German let alone using mm! Of the inch sizes, some drawings did use fractions and decimals depending to some extent on the accuracy needed, with the fractions being +/- 1/64 ".
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Perusing some of the above contributions…
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The Crown mark on a beer glass does the same as the CE mark – shows the glass has been manufactured to its appropriate weights-and-measures standard.
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The official system is not simply the Metric but the ISO's version of it, the SI.
Having used certain SI units at work… It sacrifices day-to-day practicality on the altar of High Sums and Bureaucratic Order, worsened by naming all the compound units after people to make Dimensional Analysis awkward. Though to be fair, them as makes the rules probably not affecting them personally, do rather grudgingly let us use the angular Degree and pressure Bar.
(A 5" g loco needs millions of those silly little Pascals to get moving , but is quite happy to win IMLEC on 6 Bar. On the other hand a Sound Pressure Level of 1Pa would deafen us, happy to breathe at 1 Bar but to listen with ears sensitive down to 20µPa minimum (0dB re that level) sensitivity…)
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American schools have tried teaching Metric units; and American scientists do use SI. It's noticeable now that when you hear a module-landing commentary from NASA, they read the altitudes in metres.