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Trit-u-ra′tion.

Reducing to a fine powder or magna by grinding or stamping. The action may be in a mill, a mortar, or arrastra, or on a slab by a muller. The latter is specifically porphyrization.

Trituration is generally conducted dry; levigation is comminution assisted by a liquid.

Trituration of grain is usually conducted between stones, as in grinding-mill (which see).

Of spices and allied articles, such as coffee, pepper, etc., by steel mills. See coffee-mill; paint-mill; etc.

Of drugs and snuff, by pestle and mortar. See mortar.

Of ores and rocks, by edge-rollers (see Chilian mill), stamps, or by horizontally rotating mullers in pans. See Amalgama-Tor; arrastra. See also Plates XXXIV., XXXV., and pages 1567-72.

The variety of mills or grinders is very great, and a list may be found under mill (page 1440).

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