Doing a lot of machinist work these days, all the Knew Concepts
stuff is based in English, but in thousandths of an inch. (decimal
inches) rather than fractions.
I don’t care which system, really, just don’t ask me to figure out
whether or not 33/64 is bigger than 7/16. No fractions! (and don’t
ask me to convert. Just pick a system and stick with it.)
Actually, I sat down and thought about it for a second, in my
’medieval metalsmith’ mindset.
The original english system of 12ths does make sense, for a
population that were pretty much illiterate, and didn’t understand
Running in 12ths is the lowest denominator that lets you handle
quarters and thirds easily, while still handling halves. Which was
about as much as most people needed to do. For hundreds of years.
Switching to 24ths gives you the same ease of thirds or quarters,
while doubling the resolution. Suddenly begin to notice that karats
run in 24ths? It made the math easy. Same origin for sterling.
(.925) I don’t remember what the math was, but it had something to
do with some sort of easily derived set of weight proportions that
got you to.925.)
For serious work: decimal all the way.