An Engineer in Wonderland – Measuring one metre

I take my hat off to those who have to measure to extreme accuracies.

I came across slightly long winded but interesting paper on a US website that shows just what a bugger it is.

Imagine having to allow for the number of people in the measuring room because their breath increases humidity which changes the air’s refractive index.

I also came across this paper, which by my quick and unreliable calculation  means the USA will get about 40 feet wider once the US government has fully redefined the yard.


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  1. What surprised me was that the USA did not keep its own standard and relate it to the metre.
    Perhaps the two great nations trusted one another once upon a time.

  2. Americans !
    Who do they think they are ?! re-Inventing the yard indeed ! hmmph.
    Next they’ll be changing the size of the gallon . . .

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