al improvements, New York city, who employs the masses of auriferous steam for the purpose of mix- gravel which contained too ing the fatty matter and small a proportion of the chemicals; not by direct ac- precious metal to be profita- tion, but indirectly by the bly treated by the early crude use… … hence it was soon displ of rings, and either contract- by the stronger material in HYDRAULIC MINING IN CALIFORNIA. ing or expanding them by dri- all permanent workings. The ving them into the die holes. usual dimensions of the iron feed pipes are from 22 ne machine, designed for the automatic…
Internet Archive · Public domain (published before 1931). Free to use for anything.
