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
Ashton Lever Ashton Lever Sir Ashton Lever FRS (5 March 1729 – 28 January 1788) was an English collector of natural objects. Lever was born in 1729 at Alkrington Hall. In 1735 Sir James Darcy Lever, his father, served as High Sheriff of Lancashire. Lever began by collecting seashells in about 1760, and gradually accumulated one of the richest private collections of natural objects, including live animals. He opened it to the public in April 1766, in Manchester, moving the museum to his family home at Alkrington Hall, near Rochdale, Lancashire, in 1771. In the same year he founded Archers' Hall, Inner