It’s actually earlier than that, it took standard committees decades to catch up to industry.
The 2.54 cm inch was effectively imposed by Johansson’s gauge blocs back in 1912. The Brits accepted it as the standard in 1930, the American Standards Assoc. in 1933.
The 1950s date you cite is when government finally caught up.
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When I was in school, the inch was 2.54005 cm. And I am somewhat less than 100 years old.
When was the inch defined as 2.54 cm? It was within my lifetime, but I don't recall the year.
[Edit: Looks like 1959, which is slightly before my time. It takes a bit for textbooks to catch up...]
It’s actually earlier than that, it took standard committees decades to catch up to industry.
The 2.54 cm inch was effectively imposed by Johansson’s gauge blocs back in 1912. The Brits accepted it as the standard in 1930, the American Standards Assoc. in 1933.
The 1950s date you cite is when government finally caught up.
Edit: (Gauge blocks are super cool, btw)