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A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, sand or rock dust.. Crushers may be used to reduce the size, or change the form, of waste materials so they can be more easily disposed of or recycled, or to reduce the size of a solid mix of raw materials (as in rock ore), so that pieces of different composition can be differentiated.
It featured detailed illustrations that were valuable for historians in understanding many early Chinese production processes. For example, illustrations for brick-making; one shows a kilnmaster checking the temperature of a furnace while an assistant stands by and douses the kiln to induce superficial glazing; [5] another illustration shows a brick-maker filling a wooden mold with clay while ...
The third level from the top was the crushing level. Most coal was still lump coal at this stage, and needed to be crushed in order to create smaller, more marketable product. Here, a series of interlocking, toothed crushers or rollers would break lump coal into progressively smaller sizes. [3] [4] [8]
The genus Pogonornis was introduced in 1828 by the Swedish naturalist Gustaf Johan Billberg as a replacement of Pogonias Illiger, 1811, which was already occupied by the fish genus Pogonias Lacépède, 1801.
Double-toothed kite: Accipitridae: Harpagus bidentatus (Latham, 1790) 110 Rufous-thighed kite: Accipitridae: Harpagus diodon (Temminck, 1823) 111 Lizard buzzard: Accipitridae: Kaupifalco monogrammicus (Temminck, 1824) 112 Gabar goshawk: Accipitridae: Micronisus gabar (Daudin, 1800) 113 Dark chanting goshawk: Accipitridae: Melierax metabates ...
Double-toothed barbets will eat the seeds of some fruits. [4] These barbets can be found in pairs or small family groups with helpers; lone double-toothed barbets are rare. Their territories are large. [3] [4] Double-toothed barbets roost communally, as all the barbets in a group roost in the same hole.
Saber-toothed cats of the extinct genus Homotherium lived across the globe during the Pliocene (5.3 million to 2.6 million years ago) and early Pleistocene (2.6 million to 11,700 years ago) epochs ...
The phylogenetic relationship between the African barbets and the eight other families in the order Piciformes is shown in the cladogram below. [1] [2] The number of species in each family is taken from the list maintained by Frank Gill, Pamela C. Rasmussen and David Donsker on behalf of the International Ornithological Committee (IOC).