Al-Jazari came up with an ingenious device for lifting huge buckets of water without lifting a finger? It was grandly called the crank-
connecting rod system. This was his most important contribution to engineering, and had a huge impact on the development of technology. This simple device started a revolution in engineering that has found it highest form of expression in the bicycle.
In his fourth water raising machine, Al-Jazari produced the first demonstration of useful work by the crank. The machine uses a slider crank mechanism to provide the repetitive motion of the flume ladle. The crank is considered as one of the most important mechanical discoveries made, since it permits the transmission of rotary motion to linear motion. This is central to much of the machinery in the modern world, not least the internal combustion engine. His manuscript shows he also invented or refined the use of valves and pistons, devised some of the first mechanical clocks driven by water and weights ...more

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