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Those crafty Romans...
Using a water wheel to harness power to run a sawmill, this particular example was used to cut marble into even sheets for building cladding.
I saw pictures once of an actual Roman saw, it was more complex than this drawing, in that it had five saw blades in parallel to make five sheets of marble at one time. This is one of the earliest examples in history (around 300 A.D.) of attaching a crank to a connecting rod.
Other Roman water wheels included saws for wood, grain mills and automatic hammers, both for pounding metal and as rock crushing mills for ore processing.