This handsome little 3-disc volvelle is 7 inches and is made of a lovely, coated and lightweight board. I could describe this as being in absolutely perfect condition, but I guess it would have just about killed R. Peck to scrawl his name on the back instead of the front!
What is this wheel for? I kind of know what this is, but this place can explain it better than I can:
What I don't get it why it has to be so complicated.
There are a couple of nice details that make this wheel appealing (to me, at least ). One is the pale turquoise inner disc with its slanted arm and red lettering. It's a striking combination. Second, look closely at that disc and you'll see two little divits in the extension part (look along the line of numbers)math at help you numbers you need.
The teeny, tiny print at the bottom indicates that someone copyrighted this wheel in 1940.