. Transactions. ^ in. ( mm.) of steel. In % in. (), an air inclusion of in. ( mm.) could be detected. 158 RADIOGRAPHY OF METALS Besides the work above outlined, a great deal of work has been donein the actual taking of pictures, so that the technique of radiography-through metals might be worked out. A record of a single example will suffice. Four samples of autoge-nous welds in steel were obtained. The welding had been done withan oxy-acetylene flame. The samples were 3^^ in. ( mm.) thick and. Fig. 6a.

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries