Lever Lever A lever ( or ) is a simple machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum. A lever is a rigid body capable of rotating on a point on itself. On the basis of the location of fulcrum, load and effort, the lever is divided into three types. It is one of the six simple machines identified by Renaissance scientists. A lever amplifies an input force to provide a greater output force, which is said to provide leverage. The ratio of the output force to the input force is the mechanical advantage
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