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
Lever action and would dig into the ground if the weapon was not situated high enough on its mount. The Knötgen automatic rifle is another example. While lever-action rifles have always been popular with hunters and sporting shooters, they have never been widely accepted by the military. One significant reason for this is that it is harder to fire from the prone position with a lever-action rifle than it is with a straight-pull or rotating-bolt bolt-action rifle. Another reason is ammunition. While lever-action rifles generally possess a greater rate of fire than bolt-action rifles, lever-action firearms are also generally fed from a