Lever a place to stand, and I shall move the Earth with it' is a remark of Archimedes who formally stated the correct mathematical principle of levers (quoted by Pappus of Alexandria). It is assumed that in ancient Egypt, constructors used the lever to move and uplift obelisks weighing more than 100 tons. A lever is a beam connected to ground by a hinge, or pivot, called a fulcrum. The ideal lever does not dissipate or store energy, which means there is no friction in the hinge or bending in the beam. In this case, the power into the lever equals
Darcy Lever railway station Darcy Lever railway station Darcy Lever railway station served the Darcy Lever area of eastern Bolton between 1848 and 1951. The station opened on 20 November 1848. It was on the Bury– section of the Liverpool & Bury Railway, which opened on the same day. To the east of the station, the valley of the River Tonge is crossed by Darcy Lever viaduct, which is high. It has eight spans supported by stone piers: two spans are long, and six are long. Each consists of six lattice girders: two , which also form the parapets, flanking four which are deep.