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In the so-called cross lay strands, the wires of the different layers cross each other.

In principle, spiral ropes are round strands as they have an assembly of layers of wires laid helically over a centre with at least one layer of wires being laid in the opposite direction to that of the outer layer.

Wire rope systems cost one-tenth as much and had lower friction losses than line shafts.

Because of these advantages, wire rope systems were used to transmit power for a distance of a few miles or kilometers.

Initially wrought iron wires were used, but today steel is the main material used for wire ropes.

Historically, wire rope evolved from wrought iron chains, which had a record of mechanical failure.

The Bleichert company also built hundreds of aerial tramways for both the Imperial German Army and the Wehrmacht.

In the last half of the 19th century, wire rope systems were used as a means of transmitting mechanical power including for the new cable cars.

The wire of the outer layer is supported by two wires of the inner layer.