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"
Darcy Lever Fogg died in September 1630, the holding had increased to twenty messuages, a water mill and moiety of two fulling mills along with other land in Darcy Lever In 1632 the mesne tenure had changed and Ellis Crompton after two post mortem inquisitions about John Crompton (his father), held Darcy Lever directly. By 1665, the Bradshaws had taken a considerable parcel of land for their estate. It is not sure how John Bradshaw (died 1662 ) and his wife, the daughter of Robert Lever, (who had purchased some land from Chisnall) came about the land but it can be assumed