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"
Little Lever only large house in the village which contained 9 hearths. The manor house, Little Lever Hall, built of wood and plaster was destroyed in the 18th century. It was a seat of the Levers in 1567 and after that the Andrews who inherited the Lever's estate in Rivington. There is a record of a coal pit in 1320. Records show there were fulling-mills in Little Lever before 1559. The holding of Adam Byrom of Salford who died in 1559 was described as "an estate of eight messuages, a moiety of two fulling-mills etc., in Little Lever", his three-year-old grandson Ralph,