Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 118
ng jaws, and arecrushed like eggs. These are the first mills, and 9I3-.1 NATURE AND SCIENCE FOR YOUNG FOLKS 79 do no fine grinding, the ore passing from theminto smaller mills, where it is ground as fine ascorn-meal. There is a good reason for this final grinding.The copper minerals are distributed… … THE COMPOUND LOCOMOTIVE OF THE GARFIELD AND BINGHAM RAILROAD. Two cylinders and eight driving-wheels on each side. the next process to save nearly all of the copper,gold, and silver. This is the concentrating process, and is con-ducted in great buildings on a still lower level,where the ore dust,…
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