History
In 1909, Max Bermann, an engineer in Budapest, was the first to discover that spark testing can be used reliably to classify ferrous material. He originally claimed to be able to distinguish different types of ferrous materials based on percent carbon and principal alloying elements. Moreover, he claimed to achieve an accuracy of 0.01% carbon content.
As of the late 1980s, the industrial use of spark testing is not as common as it used to be.
Read more about this topic: Spark Testing
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