powdering tub

noun3

1. •
   (no longer used) a tub in which the meat was powdered or salted; a salting tub, pickling tub or powdering trough.
2. •
   (no longer used) A heated tub for the treatment of venereal disease by sweating.
3. •
   (slang, no longer used) the pocky Hospital at Kingsland near London.