Patent US552807 Method of and apparatus for extracting ...
(No Model.) 3 SheetsSheet 1. v H. G. WILLIAMS. METHOD OF AND APPARATUS FOR BXTRAGTING METALS PROM THEIR GRES No. 552,807. Patented Jan. ''7, 1896. q W/TNESSES: m B m INVENTOH Maw fla r m PP M I R ...