Compound lever the force of pushing back the stick to the levers and they rub against the wheels, using friction to slow and eventually stop the train. These are everyday applications of this mechanism. A piano key is a compound lever of the first-class, since the fulcrum is between the weight to be moved and the power. The purpose of this lever is to translate a small movement (depression of the key) into a larger and fast movement of the hammer on the strings. The quality of the resulting tone depends on whether the final speed is brought about by gradual or
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