Lever a place to stand, and I shall move the Earth with it' is a remark of Archimedes who formally stated the correct mathematical principle of levers (quoted by Pappus of Alexandria). It is assumed that in ancient Egypt, constructors used the lever to move and uplift obelisks weighing more than 100 tons. A lever is a beam connected to ground by a hinge, or pivot, called a fulcrum. The ideal lever does not dissipate or store energy, which means there is no friction in the hinge or bending in the beam. In this case, the power into the lever equals
Hayley Lever with arthritis in his right hand, which prevented him from further travel and forced him to concentrate on still-life subjects instead. As his arthritis advanced, he taught himself to paint with his left hand. However, following the death of his wife Aida in 1949, Lever was confined to his home, where he continued to paint from 1953 until his death. Hayley Lever died on 6 December 1958 at his home in Mount Vernon, New York. News of his death surprised some: Lever had all but disappeared from public view over two decades earlier, despite once having been enormously popular and