3 ms·
Wikipedia tells me the 1893 definition of an inch "was effectively defined as 25.4000508 mm (with a reference temperature of 68 degrees Fahrenheit)", and it was
by eesmith 4y ago
Wikipedia tells me the 1893 definition of an inch "was effectively defined as 25.4000508 mm (with a reference temperature of 68 degrees Fahrenheit)", and it was Carl Edvard Johansson's gauge blocks which helped define the industrial inch to 25.4 mm "in both the U.K. (1930) and the U.S. (1933)."
https://en.wikipedia.org/wiki/Inch https://en.wikipedia.org/wiki/Inch
https://en.wikipedia.org/wiki/Carl_Edvard_Johansson https://en.wikipedia.org/wiki/Carl_Edvard_Johansson
- defrost 4y agoThe meat of which is the astonishing fact (well, astonishing to some) that the US weights and measures ARE metric .. being literally fundemently defined on the back of a metric base. All the same, telling people that the USofA was one of the very first adopters of the SI metric system and still bases all its measures on metric will get you a few odd looks.