What is this?

[glatt]

Originally Posted by Lamplighter

Both of Glatt's tools above and the old gauge here show that our
forefathers were not dummies.

On my bedside table I have the Dictionary of American Hand Tools. I freaking love it. I've read it cover to cover twice, and just about every night, I open it up at random and just start reading. Before I got it, I knew about 70% of the tools in there, and after reading it a few times, I now know about 95% of the tools in there. But I keep finding new things that I hadn't noticed before. I'm surprise the basal area gauge is not in there. I'll have to check again tonight.