Amnesia is scary and I'm stuck at the cistern/controlroom

[Hunter of Shadows]

You must throw a stone onto the rope at the top of the bridge...as simple as that.

That's not entirely true

The control room CAN lower the bridge

Here's how the control room puzzle works

1. Find all the loose pipes lying around, and go to the far most back room and place them onto the wall, you must rearrange them until you hear a hiss and you can no longer move them around.

2. You must go to the room with an object that looks like a very large piston, you must pull the levers until it is lowered all the way down, and the levers become stuck.

3. As stated above, you must pull the wheels until the weights are all the way to the top.

4. then go back to Cistern entrance, and pull the lever, the bridge will lower for you