As he did so, she stepped forwards and got a closer look at his creation. There was a single, very large brass cylinder, thin-walled and fairly light -- that was the one he filled with water. From what she could tell, it fed water into another cylinder that had some strange things happening to it. There were lots of pipes and things going into and out of that one. Including one copper conduit to another cylinder that Artemis knew was filled with the smelly heating oil. Besides that, the bundle of rods and gears seemed more to be assembled next to the water-and-oil assembly than a part of it. It still didn’t make any sense, but the Royal Engineer certainly seemed enthusiastic, so it must be interesting.