We all know how a wind-sock works. Right?

[Fishtigua]

 

[DavidJ]

I had no idea that they were graduated. I’ll never look at a windsock in the same way again

 

[vas]

not only that, I didn't even know you call them windsocks ?

 

[julians]

It's a bit like the mull of kintyre test for film clasification

What does the Mull of Kintyre have in common with censorship?

 

[Northern Star]

Can this also be used as a viagra dosage indicator?

 

[BruceK]

That's pretty useless, the wind starts at 15 knts round here

 

[vas]

Bruce, it's an excellent opportunity to combine your comment with #4& #5 and develop the windsock V.2 with an extra 4 steps taking you up to 27kn.
Guess v.simple once you solve the technical issue of lifting the bits up (invert the 4 first steps to visualise)

V.