from The Century Dictionary and Cyclopedia
- n. A mill or machine for crushing or grinding stone or ores for use on roads, etc.; an ore-crusher; an ore-mill; a stone-breaker (which see).
- n. It consists, usually, of two or more jaws of hardened or chilled metal which are brought together to a gaged distance by a toggle-joint or other system of levers. The rock is fed in to the upper end of these jaws, which are inclined to each other, and as the movable jaw recedes from the fixed one and advances toward it by the toggle action, the rock feeds itself downward and is crushed by the nip of the jaw. The first crusher was designed by Blake of New Haven, Connecticut, and first patented in 1858. In connection with crushers there are usually sizing-screens,—revolving hollow barrels with perforated sides,—by which the crushed material is mechanically sorted. Crushers are much used in the building of permanent roads, the manufacture of concrete and cement, as well as in mining and the separation of ores.
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