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A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. Crushers may be used to reduce the size, or change the form of the waste materials so they can be more easily disposed of or recycled, or to reduce the size of a solid mix of raw materials so that the pieces of different composition can be differentiated.

Ore Crushing Machine

A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. Crushers…

"Bill shorter than head, comparatively stout at base, very acute at tip, the culmen quite convex, the gonys just appreciably concave, Tarsus a little longer that the middle tow an claw. 3d and 4th primaries about equal and longest, 5th and 6th successively slightly shorter, 2 d equal to 7th, 1st equal to penultimae secondary in the closed wing. Entire upper parts, including surfaces of wings and tail, uniform dull pale grayish-brown, with narrow, faintly-rusty edge of the wing-coverts and inner quills, and equally obscure whitish tipping of the tail-feathers. No maxillary nor auricular streaks; no markings about the head except slight speckling on the cheeks. Under parts brownish-white, palest (nearly white) on the belly and throat, more numerous small arrow-head spots on the color of the back. Bill light-colored at base below." Elliot Coues, 1884

Arizona Thrasher

"Bill shorter than head, comparatively stout at base, very acute at tip, the culmen quite convex, the…

"Brownish-ash, with a faith olive shade, the wings and tail purer and darker fuscous, without white edging or tipping. Below, a paler shade of the color of the upper pats. Throat and side of the lower jaw white, with sharp black maxillary streaks. Cheeks and auriculars speckled with whitish. Under tail-coverts rich chestnut, in marked contrast with the surrounding parts. Bill black, at the maximum of length, slenderness, and curvature; feet blackish." Elliot Coues, 1884

Crissal Thrasher

"Brownish-ash, with a faith olive shade, the wings and tail purer and darker fuscous, without white…

"Upper parts uniform ashy-brown; wings and tail similar, but rather purer and darker brown, the former crossed with two white bars formed by the tips of the coverts, the latter tipped with white. Below dull white, often tinged with rusty, especially behind, and thickly marked with small, sharp, triangular spots of dark brown or blackish. These spots are all perfectly distinct, covering the lower parts excepting the throat, lower belly, and crissum; becoming smaller anteriorly, they run up each side of the throat in a maxillary series bounding the immaculate area. Sides of the head finely speckled, and auriculars streaked; bill black, lightening at base below, little longer than that of H. rufas, though decidedly curved." Elliot Coues, 1884

St. Lucas Thrasher

"Upper parts uniform ashy-brown; wings and tail similar, but rather purer and darker brown, the former…