This shunt is a type of resistor built of copper and designed to carry a current. It was part of the Hydro generator control metering system. It reduces the large current to a small voltage.Historical: This equipment represents a major construction and ongoing operational industry dealing with the supply of hydro electricity to Victoria.Made of copper the shunt has a middle cube with 12 sheets of copper, 5mm apart formed like shelves. On either side of the cube are two shelves coming out from the middle. Both have 2 hollow circles 17.5mm in diameter 25 mm apart in the middle. At the Join of the 'shelves' and cube is a screw on each side.Screwed in metal plaque: Deriv. 1662691 / OHM 0.0000833 / AMP 1200 on the side of the cube above a shelf and on the opposite shelf: ALTO ----> (also a metal plaque screwed on). kiewa hydro electric scheme. secv. hydro generator. victorian electricity grid, power station. electricity., resistor