(1860 – 1939)

Electrical engineer.

Father of the electric transformer, the tension regulator, the watt meter, the alternating current motor, the turbo generator and high-efficiency turbo generator. By the end of the 19th century, many Italian current-generating plants were operated by his automatic mercury voltage regulator.

Invented: automatic mercury voltage regulator for direct-current dynamos (1884).

Credited with: high-precision watt meters, alternating current transformer (1885).