WoW. Great idea. I used a ruler like that when I was doing newspaper layouts. That was back in the day, after lino-type, but before computer layouts. We did wax paste up. I found it most helpful when I was wrapping text around a photo. I have a feeling that I'll be plundering through all my drafting supplies again in the near future to dig that out. I can see the value in using that tool for fussy cuts too.