So this is my latest style of Cobblestone Generator model that I've been toying around with on my not-seen legitimate Minecraft file. It's major difference is that it uses Pistons and a Clock. On my actual legit world, I have a generator with a huge clock and requires 4 lava and 4 water to build.
So this is the next level up, using less material to build similar effects and being much smaller -- you can't lose!
A few things about the video:
1) I do not recommend speeding up the clock in ANY way. If you can figure out a way to keep the power "OFF" for a longer period of time, it'll be slightly more effective. This is because you *NEED* to give the lava time to turn into cobblestone.
2) The method I recommended to keep the tower shorter is for those who already built the full tower. For those who originally don't want the tall tower: before activating the clock, place the Furnaces on the top-most Sand blocks (on all 4 sides).
3) I DO NOT recommend placing this in any structure made of Wood. Lava causes things to burst into flames, so unless you do extensive research on Lava, I DO NOT recommend building in or near a wooden structure.
4) I did not do any research on many cobblestone generators with pistons. So I do not claim ownership to this device unless I'm really the first who built it. If anything, I'm getting the word out there. (Edit: turns out that this is my generator. I'm the first to make this type, and the first to enhance it! Check out my updated version!)
5) If you're wondering, a single tower is extremely less effective due to improper or slow build-time. Take advantage and use all 4 waters to make 4 towers.
6) The last few seconds probably cut out. This was due to a bug upon media conversion. The other half is my laziness of not trying again.
7) I originally thought that it was a 100% collection ratio. But I remember that if you stood on top of a pushed block, you have a chance to fall through it, so I applied the same logic to the cobblestone loot. It's rare when it happens, but it could theoretically happen. So: 99.9%
I'm working on a story (currently on break until I get through some personal things here in Costa Rica), if you want to read it, check out the link -- zirumshero.blogspot.com