Lever force F at a point "A" located by the coordinate vector r on the bar. The lever then exerts an output force F at the point "B" located by r. The rotation of the lever about the fulcrum "P" is defined by the rotation angle "θ" in radians. Let the coordinate vector of the point "P" that defines the fulcrum be r, and introduce the lengths which are the distances from the fulcrum to the input point "A" and to the output point "B", respectively. Now introduce the unit vectors e and e from the fulcrum to the point "A"
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