Note:  Do not rely on this information. It is very old.

Connecting Rod

Connecting Rod, in Engineering, is a bar of wrought-iron or steel used as an intermediate link to convert the alternating straight-line motion of the piston into the rotatory motion of the shaft. Its one end grasps a cross-head at the end of a piston-rod, the other end holding a crank-pin which travels in a circle by reason of its rigid connection with the driving-shaft.