A universal spectrographic method has been developed for the determination of the following elements in iron and steel: Silicon, Manganese, Nickel, Chromium, Cobalt, Molybdenum, Titanium, Niobium (Columbium), Vanadium, Aluminum, Copper, Silver, Lead and Tin. The method has proven itself highly satisfactory in classifying or characterizing samples of iron or steel. It is universal in that it can be applied to any sample of 0.010 gram or larger irrespective of size, shape or previous history.
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