The Beaufort Scale is a means of measuring wind speed by visual inspection of indirect factors like rustling leaves or waves on water. I think its a useful means of assessing flight safety in the field.
The British National Meteorological Library and Archive published an excellent history and overview of the development of the Beaufort Scale, and in the back was a comic, drawn in 1906 by George Simpson, an explorer and meteorologist who extended the Beaufort Scale from observations at sea to observations on land. The comic is great. I cleaned it up so that it would display better and could be used as a print handout: