Well, I’ve had a look at Vitruvius’s sketch in the old manuscripts, and it’s a lot like a giant, ancient water‑pump with a dial. Basically, a reservoir feeds a small stream into a series of calibrated tubes; the flow turns a gear that marks the time on the sundial. The trick was to keep the pressure steady enough that the gears moved at a predictable rate, so they had to balance the height of the water source with the friction in the tubes. Modern engines use the same idea on a much finer scale. Think of a pressure regulator in a car’s fuel pump or the way a hydraulic press keeps a constant force. The principle that water (or any fluid) can transfer force through a pipe is still as useful as ever. What’s changed is that we now have precise valves, sensors, and digital controls. The ancient clock’s “dial” was a physical, mechanical indicator, while today we might show the same thing on a screen. So, yes – the design principles are still around. The only thing that’s really evolved is that we’ve swapped the hand‑turned gear for a computer and a tiny micro‑valve, but the heart of it is the same: steady pressure, measured flow, predictable motion. If you ever want to build a working replica, just don’t forget to check the seals; those ancient tubes were probably leaking like a tired tire.