The simulation revealed that despite providing a mechanical disadvantage, the short lever arm of a sprinter's heel actually produced more force than the longer lever arm of a non-sprinter.

The Federal Reserve, like most major central banks, has already lowered its short-term interest rate, its main policy lever, in effect to zero.

The rollers are carried by an L - shaped lever, fixed to a horizontal shaft, which also carries short arms to which the reed and gripper guides are fixed.