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Pylons of Messina
The electric Pylons of Messina were used from 1955 to 1994 to carry a 220 kilovolt (150 kilovolt until 1971) power line across the Strait of Messina, between the Scilla substation in Calabria on the Italian mainland at and the Messina-Santo substation in Sicily at .
==Design==
The two pylons, built in 1955, are both free-standing steel towers. Each stands on an cross-shaped base and is equipped with a crossbar that carries four conductors at a height of , and another V-shaped structure at the top which carries two additional conductors in addition to ground wires. In contrast to more conventional pylon design, the corners of the pylons are arranged diagonally along the direction of the course of the line. The pylons of Messina were the model for the Elbe Crossing 1 in Germany and were, until the completion of Elbe Crossing 2, the tallest pylons in the world.
After their completion, the oscillation of the structures and their maximum deflections were determined in a very unusual manner: engineers mounted three rockets with a thrust of 9800 kilonewtons on top of the pylons and ignited them.〔Turmbauwerke, Bauverlag GmbH, Wiesbaden, 1966〕
The line had switching stations at each end of the span. At the Calabrian station, Cannitello, (), the conductors were fixed tightly to a strainer portal. At the Sicilian station at ''Torre Faro'' (), the conductors were strained by a device providing constant force, which was situated in a building with two inspiring towers.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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