Lever the power out, and the ratio of output to input force is given by the ratio of the distances from the fulcrum to the points of application of these forces. This is known as the "law of the lever." The mechanical advantage of a lever can be determined by considering the balance of moments or torque, "T", about the fulcrum. where F is the input force to the lever and F is the output force. The distances "a" and "b" are the perpendicular distances between the forces and the fulcrum. Since the moments of torque must be balanced, formula_3 .
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.