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 by about 1900 the firm had become a limited company. In 1951 Potter's amalgamated with the Eaglescliffe Chemical Company. The company closed in 1969 when it was owned by Albright & Wilson. Until closure Potter family members remained in senior management positions. Edmund Peel Potter was prominent in the local community and endowed a hospital on Chorley New Road, Bolton in pre-NHS years. His son Colonel Colin Kynaston Potter served with distinction in the Boer and First World Wars.(Ref.Papers in Little Lever library reference section) Little Lever was a hamlet, bounded on three sides, by the water courses, the River