Does anyone know anything about the broken slash that sometimes appears in precomposed fractions – whether there was a clear first precedent, or if it goes back to metal?

@w__h_ Metal. Cos I’m lazy, here’s a pic from Pitch design info. The caption is a bit unhelpful,

“Above: 5pt Excelsior from the Linotype specimen book. Below: Pitch fractions.”

@klim @w__h_ Used Pitch fractions purely because of this for a metal ruler.
@onpaperwings Where does one have a custom metal ruler made?
@jesserewing A place that makes them in Syracuse, NY, I believe? I made them for my pals @shiflett @sean @nick