Compound lever sudden movement of the key. The earliest remaining writings regarding levers date from the 3rd century BC and were provided by Archimedes. ""Give me a place to stand, and I shall move the earth with a lever"" is a remark attributed to Archimedes, who formally stated the correct mathematical principle of levers (quoted by Pappus of Alexandria). The idea of the compound lever is attributed to the Birmingham inventor John Wyatt in 1743, when he designed a weighing machine that used four compound levers to transfer a load from a weighing platform to a central lever from which the weight
Front lever Front lever The front lever is a gymnastic and calisthenic move - a static hold normally performed on the still rings or the pull-up bar. A front lever is performed by lowering from an inverted hang until the body is completely horizontal and straight with the front of the body facing upwards. An accomplished gymnast may also pull directly into the horizontal position from a dead hang. Front levers require a high degree of back and core strength. The move is rated A in the gymnastic code of points, a scale from A to F, with F being the most