Agroshield
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A good, old, rare book on spark testing has recently resurfaced in electronic fomrat:
Very Rare Spark Testing Book
I have provided a link to the very rare spark testing book that it out of copy right due to non renewal of rights and age. The book is called The Spark Atlas by Gerhart Tschorn 1963. Maybe someone can cleanup the pdf. I have an antique hammer that I am trying to identify the steel so I can weld...
www.practicalmachinist.com
