I had to google it also. If my brain is working right this early the principal is you are cutting the stringer length in half right?
Nope. I'm basically reversing the angle on the stairs, making them twice as steep as normal stairs, but at the same time, making them have a similar rise over run as a normal stair.
Thomas Jefferson was a smart man. People can be that way if they don't have internet, Facebook, rap music and cable television.
