Lever resistance (or load). It is common to call the input force "the effort" and the output force "the load" or "the resistance." This allows the identification of three classes of levers by the relative locations of the fulcrum, the resistance and the effort: These cases are described by the mnemonic "fre 123" where the fulcrum is in the middle for the 1st class lever, the "r"esistance is in the middle for the 2nd class lever, and the effort is in the middle for the 3rd class lever. The lever is a movable bar that pivots on a fulcrum attached to
Darcy Lever that Levers daughter had inherited them and thus they passed to her husband John Bradshaw. However the land came to them, the family estate grew and today they continue to hold large parts of the Bolton area. At this time, 1666, Robert Lever had eight hearths liable to tax, James Bradshaw and John Crompton had seven each and Lawrence Fogg six. The rest of the township was made up of 12 more heaths. The land-tax return of 1786 shows that James Bradshaw and John Peploe Birch were the chief proprietors of Darcy Lever, between them they paid about half the