How To Use An Architectural Scale

In this video I show you how to read/use an architectural scale. I also go over the online tutorial at www1.udel.edu/p...
I made a pretty bad mistake around the 9 minute mark... can you figure out what I did wrong and why? Instead of telling you, see if you can figure it out. It's a common mistake to make with these scales.

[@MarkJohnston]

I made a pretty bad mistake around the 9 minute mark... can you figure out what I did wrong and why? Instead of telling you, see if you can figure it out. It's a common mistake to make with these scales.