We had several kinds. They were cobbled together lumber, mostly 2x4s. I and brothers milked 4-5 cows, twice a day, by hand of course. Then we ran it through a separator. Mom/dad sold the cream and the skim was fed to hogs. That was in the mid 1960s. I can still smell it and absolutely hated milking those cows.
You just described my youth and what we did for a 35 cent a week allowance.
kwg