So, when you have to land a big one, we need to steer it. The problem is, when the rudder itself weighs many tons and is subject to hundreds of tons sometimes of hyperdynamic force, you need either a wheel of a miss diameter with ten of people to turn it like they had on some of those one-I-L-South seniors or you need the assistance of a steam engine. Right now, we've got to follow it by hand in case the engine fails. But the way we would work this normally is to put it in a rick-ship. See, the quadrant that indicates the starboard is that way and there's the raft that drives it up top. See, so, we'll go back to mid, we'll walk in the steam engine and set. Now, this has been freely, there's no turning on the rudder. This is a computer. It only goes in the direction I tell it to as far as I tell it to. Even a quarter turn on one turn of the brake shaft, you see? It's very controllable. The way it works is there's a computer in here. A very simple computer. It's made by a screw is its first component. The second component just like that weights there is a four-way valve in there. The four-way valve switches the admission and exhaust. It's also a throttle valve. So, if it's in the center, no steam goes anywhere. If it's to one side, steam goes down the admission port and exhaust port one way. And if it goes the other direction, it flips the exhaust and admission logic. There's piston valves. So, if you offset the valve from center one way, the engine will turn starboard. If you offset it, the other way, it'll turn port. The way you offset it, as you'll see, when I turn the small wheel, I turn the screw inside of the screw collar. And you'll see, I make the valve move up and down. See, the valve rod doesn't rotate only the screw does. The way it works, when I turn the screw and move the valve one way or the other way, the engine will want to run. But when the engine runs, it turns the screw as well. Back the other direction. Or I say it turns the screw collar. So, when I turn the screw, the engine will run and turn the screw collar and move the valve back to center. So, the engine always seeks to find the center. And of course, at which point, when the valve reaches the center, the engine stops because the steam flow is shut off. So, that's the computer that operates the steering engine. And... You'll see... It will break the force of my hand, and it will magically fire you. Or it will immediately start blowing. Well, two fingers. So, the command of my fingers is being magnified into enough force to move an immense rudder. It's just a force magnifier. Cars have power steering that works in a similar way with hydraulics and hydraulic pumps. Now, we'll see... Quite a lot of steam gets by it even when it stops. That's for two reasons. The valve of a steering engine always needs to let a little bit of steam by to keep the engine warm. Because there will be periods of time where the ship's rudder does not move on the open sea sometimes for hours. Or at least periods of 15 minutes, 20 minutes between course corrections. If the engine remained stationary for that amount of time with no steam flowing through it at all, of course, the next time you went to steer the ship with a steam power, the engine would digest lots and lots of water slugs and blow its heads off. So, you need a flow of steam always going through the steering engine to keep it warm and ready to work. It needs to be ready to operate at any command at a moment's notice. The other reason why it leads that much. The amount of steam going through it should be far less than this, but unfortunately, most of these steering engines, especially this one, so a very hard service line. They didn't get proper lubrication to that piston valve. And they just wore to the point where there's a lot of leaf by. And in a ship like a tugboat, especially, which is working all the time, doesn't have access to a big fitter's yard. And where they didn't care that much by the end of the steam era, these engines all got like this. Now, this is a pretty bare bones one. If you would go to a steam liner, you will find three HP steering engines with three cranks at 120 degrees. The Olympics had something like that. And they, of course, would be maintained that they hardly any leak by at all. Some of them would have automatic drain valves and things like that. This one just has a pair of cylinder drains right down here. But, and of course, like on any ship, this would exhaust it into the condensate. So, it wouldn't fill your wheelhouse with steam and you'd get a bit of an horsepower boost from the vacuum. But that is a steering engine, quite a nice one from Duncan. He'll often get new capsule upon time. And the last engine we have to show you is actually fairly special to me. It doesn't pay for my friend, Dick Gibbons. We'll see if we can move the hose over to it and get it off the roof.