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
Charles Lever clergyman. Lever and Boyle earned pocket-money singing ballads of their own composing in the streets of Dublin and played many other pranks which Lever embellished in the novels "O'Malley", "Con Cregan" and "Lord Kilgobbin". Before seriously embarking upon his medical studies, Lever visited Canada as an unqualified surgeon on an emigrant ship, and has drawn upon some of his experiences in "Con Cregan", "Arthur O'Leary" and "Roland Cashel". Arriving in Canada, he journeyed into the backwoods, where he was affiliated to a tribe of Native Americans but had to flee because his life was in danger, as later his character