Ring gauge

[Pugman1943]

Both scales are European in fact. Anders Celsius developed his several years AFTER Daniel Gabriel Fahrenheit introduced his. I'd say metric is more easy on the brain as it is WAAAAY easier to divide or multiply times 10 than try to do it in 16ths, 32nds, etc. Or at least on this old fart's brain!

OK, so let's beat this dog to death, why not just one scale. Was was gained by going Celsius or the other way around. Unless folks were comfortable with 65° F or 3/4 mile At the time and of course someone must stir the pot ( or smoke it ).