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Show Largest Rock Crusher In Operation. Tho largest rock crusher In tho world was recently thrown Into operation opera-tion In n cement mill nt South Pittsburg, Pitts-burg, Tenn., and It crushes all tho rock used by a 4,000-barrel plant. Tho machlno has tin hourly capacity of 800 tons nnd GO per cent, of the product Is In pieces four Inches or loss and 30 per cent In pieces two Inches or less. Tho crusher Is 10 foot In holght nnd weighs 425,000 pounds. Tho hopper Is 20 feet In diameter. Tho operation of this machine alono requires 29 horse power. |