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[smjjames]

This is the first time I'm doing a magma piston and while I understand the concept, I'm still trying to figure some aspects out.

1. How do I make a magma piston send magma from a larger reservoir into a smaller catchment basin and into a series of channels? I have an idea of how i might do it since I want to spread the magma out rather than having it in a large square catchment basin (though I can easily just channel out the edges of the basin to make channels, but still.....) although maybe instead of making the reservoir bigger horizontially, I can make it bigger vertically.

2. If I make bridges on top of the piston, will it still fall when I break the support or will the piston end up sticking to the bottom of the bridges? (then again, the magma might end up underneath the bridges, which isn't my intention)

3. If I were to make say, a 6x6 reservoir that is 1 level deep, fill that with 7/7 magma, would a catchment basin of the same size fill would the exact amount of magma? I'm just trying to get a sense of how the math and the magma distribution works out.

[Merendel]

1 Not quite sure what your asking.  When you trigger the magma piston you will end up with 7/7 magma the size of the piston siting on top of it in its catchment area.  This will spread to be on top of the bridges as well so you'll end up with a bit less than 7/7 due to that spread.  From there you simply move the liquid to any additional locations with normal fluid controll mechanics.  Leting it spread through a tunnle leading to an initial holding tank befor you distribute it to other locations with a floodgate to stop the flow from the pistions uper basin.   you can also use pumps if need be to move magma around

2As to the bridges make sure they are ancored to the walls and not the piston and you'll be fine.  Bridges wont support the piston but obviously will deconstruct if you have them ancored to the piston instead of the wall.

3 The pistion will always move exactly whatever lava is directly under it when its fired.  Say you have a 10x10 pistion and you have that area below it filled 7/7.  100 tiles of 7/7 will appear on top of the pistion or 700 units of magma that will then try to spread into whatever space is avalible.