( n. )
Any implement or machine working with a rocking motion, as a trough mounted on rockers for separating gold dust from gravel, etc., by agitation in water.
( n. )
Any implement or machine working with a rocking motion, as a trough mounted on rockers for separating gold dust from gravel, etc., by agitation in water.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012