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Washbox Air Cycle
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The valve-timing cycle determining the periods of air admission and exhaust.
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Warping
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The slight flexing or bending of the Earth’s crust on a broad or regional scale, either upward (upwarping) or downward (downwarping); the formation of a warp.
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Wash Pipe
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The pipe that ejects the jet of water through the bit, used in wash boring.
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Wave Diffraction
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The cooperative scattering of any electromagnetic radiation where it
encounters an obstacle, esp. the edge of an obstacle, resulting in
constructive and destructive interference. Also, a single event resulting
from constructive interference.
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White Sand
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Sand that is usually quartzitic and pure enough to resist heat and slags; used for the final layer in Siemen’s steel furnaces.
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Wacken
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Rocklike clay, formed by the decomposition of basalts in situ
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Wet Gold-silver Ore
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Lead ore with high silver content. During smelting, the lead trickles through the mass and collects gold and/or silver, which are later recovered.
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Wave Front
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In seismology, the surface of equal time elapse from the source point to the position of the resulting outgoing signal at any given time after the source charge has been activated. In a more restricted sense, the surface along which phase is constant at a given instant.
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