It just has the slight problem of weighing 200 tons which makes it mildly impractical for anything but use at home. And yet, somehow it was the standard method

It just has the slight problem of weighing 200 tons which makes it mildly impractical for anything but use at home. And yet, somehow it was the standard method of operation for more than half a century before plastic bowls became widely available. I feel bad for those poor 1940's housewives, all hunched over and disfigured from dragging 200 tons of Corningware to the church potluck supper.