I came across an article on Make
on how to fold a piece of paper into thirds. I thought the technique was cool, but the third marker point is at a rather strange location on the page, making it hard to fold the page.
I decided to dive deeper into the subject of mechanical construction and dividing a straight line into equal segments. The applet
shows you how to use a ruler and a compass to divide a line into N segments. I still wasn't happy with this technique because it requires multiple tools and the lines go off the page.
From the mechanical construction technique I noted that a reference line is created of arbitrary length. The line is created by drawing N segments and then projecting this onto the line we are trying to divide. This tutorial uses a similar technique, but using the paper itself as the line segments. You might find this useful, so take a look!