100 years ago in AMERICAN MACHINIST Early die sinking EDM In the October 11 1900 issue.

100 years ago in AMERICAN MACHINIST
Early die sinking EDM
In the October 11 1900 issue, AMERICAN MACHINIST editors reported onward several new methods of machining shown at the World Fair, including a self-contained gas furnace, a horizontal driller, and `an ingenious rule of die-sinking.'
Joseph Rieder of Liepzig mold a design upon a block of plaster of Paris. He then placed the close so that its lower half was immersed in an electrolytic lonely dwelling containing a chloride and ammonium solution. The solution then rose to the mold top of the fill up by `capillary ...

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