What is "bucking stool"

Bucking \Buck"ing\, n.

1. The act or process of soaking or boiling cloth in an alkaline liquid in the operation of bleaching; also, the liquid used.
   --Tomlinson.

2. A washing.

3. The process of breaking up or pulverizing ores.

   Bucking iron (Mining), a broad-faced hammer, used in bucking or breaking up ores.

   Bucking kier (Manuf.), a large circular boiler, or kier, used in bleaching.

   Bucking stool, a washing block.