Greetings from North Carolina USA, I am hoping to learn and admire the art of cartography from European to American work. Thanks for all of your help in advance.

Can anyone tell my anything about this wind rose? I found it while perusing the denver library website.

Click image for larger version. 

Name:	photo 32.JPG 
Views:	131 
Size:	740.3 KB 
ID:	54075