I remember an interview with an archeologist that studied the Nazca Lines. She said one year she had a grad student who was a farm boy. He showed her how to draw a long straight line by setting up a stick a 1000 feet away and then just walking towards it while dragging a another stick behind him. It was perfectly straight.
It's basically the same as the old draftsman's trick for drawing a straight line.
It’s quite accurate, somewhat hard to believe until you try it a few times. Good enough for many layout tasks if you’re drawing a reference line to cut to, for example.
Also works for cutting straight lines with an exacto knife.
It's basically the same as the old draftsman's trick for drawing a straight line.