Posser

Possers come in various forms; there is usually a vertical pole with a handle bar at the top but the base can be conical or domed.

A similar tool with three (or more) legs was called a variety of names including posstick, peggy-legs, dolly-legs, and dolly-peg.

[2] Clothes washing in the early nineteenth century rarely used soap, "bucking" with lye instead.

[4] By the end of the nineteenth century, the tradition of a weekly washing day had been established.

The posser was not so much used to hammer the dirt out of the clothes, as to agitate the water which would be forced under pressure through the holes.