Ferrography is a technique for analysing the particles present in fluids that indicate mechanical wear. It uses microscopic examination and was developed in the 1970s by Vernon C. Westcott for predictive maintenance, initially analysing ferrous particles in lubricating oils. ...
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http://en.wikipedia.org/wiki/Ferrography
an analytical method of assessing machine health by quantifying and examining ferrous wear particles suspended in the lubricant or hydraulic fluid.
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http://www.encyclo.co.uk/local/21121
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