Source : Webster's Revised Unabridged Dictionary (1913)

Pattinson's process \Pat"tin*son's proc"ess\ (Metal.)
   A process of desilverizing argentiferous lead by repeated
   meltings and skimmings, which concentrate the silver in the
   molten bath, the final skimmings being nearly pure lad. The
   processwas invented in 1833 by Hugh Lee Pattinson, an English
   metallurgist.