This is a Cobblestone Generator and collector. Basically, when you push a button a block of ignited TNT falls down onto the 'Explosion Platform' (Generated cobblestone pushed into different places) and then explodes.

The item block thingy then falls down into the water flow chamber container thingygummywhat and then floats down towards the button where you're standing and you can pick it up. The 'magazine' which holds the TNT can hold 10 maximum, and you get approximately 10 blocks of cobblestone every explosion, bringing the total to ArOuNd 100 cobblestone before you have to reload. I'll put a video of how it works and it in action soon, it's just having to convert files then upload to youtube.

I may have rambled on a bit, don't blame you if you skipped straight down here. I'm talkative at the moment for some reason. Anyway.

Back soon with more redstone stuff!