Also, my metric crew rise up!! The inch is legally defined by the metric equivalent.
this post was submitted on 18 Nov 2023
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3-plate flatness method crew unite!
I find it interesting that our current definition of the inch is based on an industrial standard that had been in use for decades. And that that standard was, in effect, created by one man.
tldr: Carl Edvard Johansson was a Swedish manufacturer of gauge blocks who built his one-inch blocks by ignoring the differences between the UK standard inch and the US standard inch. Those standards were only a few millionths of an "inch" (pick one!) apart anyway, so throwing away most of the decimal places must have seemed like a good idea.
Fun fact: precision was perfected in America and exported to the world. Your millimeter is a direct descendent and would not exist without the vastly superior mil.