What machine did Leonardo da Vinci design to automate sawing timber?

Leonardo da Vinci designed a hydraulic saw to automate sawing timber. Water power drove the mechanism, while linked parts converted continuous wheel movement into the back-and-forth motion of a saw.

The design reflects Leonardo's close study of mills and mechanical transmission. A waterwheel could provide steady power, but a saw required a controlled reciprocating stroke. Gears, cams, and connecting members allowed the machine to transform rotary motion into repeated cutting motion.

A hydraulic saw was valuable because cutting wood by hand was slow and physically demanding. Automating the stroke could improve output and make the work more regular. The machine still required workers to position and feed the timber, so it was not a completely unattended factory.

Leonardo did not invent water-powered machinery from nothing; mills and waterwheels were already established in Europe. His contribution was the detailed analysis and combination of mechanisms. The saw is therefore best understood as an ingenious refinement of hydraulic mechanical technology.