THE need for the conservation of materials has stimulated interest in the various methods of salvaging components which have become worn in service or inadvertently machined under‐size. The practical methods now employed include electro‐deposition, “fescolizing”, bronze welding and metal spraying. There remains a good deal to be learnt on the subject from the technical point of view, and it can safely be said to have touched only the fringe of the vast wastage of scrap components which could be recovered, with considerable saving in material, labour and money.
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