A Method for Micro-Spectrography of Metals

Qualitative spectrographic analyses of metallic areas of less than 0.05 mm in diameter can be obtained by means of the equipment and methods described. The apparatus consists of (1) a device for holding a counter electrode and the specimen to be analyzed, (2) an electronic spark generator, and (3) a medium quartz spectrograph. Minute areas such as inclusions, segregations, crystalline phases, surface contaminations, metallic platings, and the extent of metallic diffusion have been successfully analyzed.