I came across an old set of castings for a Stuart steam engine. The drawings were all in fractions, down to 1/64th if I remember. Also recall seeing other old drawings in fractions rather than decimals. Guess they'd save converting.
As a side note, bought a 12 inch ruler that was in 10ths, forget the smallest division. Thought it would be great in the machine shop. Hated it, if Im using a ruler its for rough measurements, as in cutting stock on the saw or marking a chalk line for the torch, fractions seam to make more sense then
Greg