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 were several collieries in Darcy Lever, the Darcy Lever Pit, Davenport Pit, Snow Hill Pit, Victoria Pit, Top o'th'Meadows Colliery. In addition closer to Farnworth there was Fogg Pit owned by Andrew Knowles and Sons, near the Bolton and Bury Canal, which was the scene of an explosion which killed 10 miners. Darcy Lever was a township or civil parish in the ecclesiastical parish of Bolton le Moors in the Salford hundred in the historic county of Lancashire and in 1837 became part of the Bolton Poor Law Union. In 1898 Darcy Lever was incorporated into the County Borough of