The Collaborative International Dictionary
Sweepwasher
Sweepwasher \Sweep"wash`er\, n. One who extracts the residuum of precious metals from the sweepings, potsherds, etc., of refineries of gold and silver, or places where these metals are used.
Wiktionary
sweepwasher
n. (context dated English) One who extracts the residuum of precious metals from the sweepings, potsherds, etc., of refinery of gold and silver, or places where those metals are used.