This new plant takes high-tension polyphase current from a water-power thirty or forty miles away at Paderno, on the river Adda, flowing from the Apennines; but delivers low-tension direct current for distribution to the regular Edison three-wire system throughout Milan.
"Edison, His Life and Inventions"
Frank Lewis Dyer and Thomas Commerford Martin
He designed and built his 'A.C. polyphase System' which generated three-phase alternating current at 25 Hz.
"The Dawn of Amateur Radio in the U.K. and Greece A Personal View"
Norman F. Joly