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ASK THE EXPERTS!!
Several kids wrote letters to ask the question, here is Renny's:
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Then he went on to explain another reason. "It lets us know which way the wind is blowing." Why do workers care about that? Sometimes the crane's job is to operate the pile driver, said Mr. O'Toole. At our site it is acting like a big hammer, driving 100-foot long cement pile into the ground. As you can imagine that heavy cement hits the ground with a lot of force. And each time it does, the oil greasing the crane flies off--almost like the water droplets coming off a wet, shaking dog.
If you were a worker, wouldn't you want to know which way the wind was blowing so you'd know which way that oil was going to fly? Otherwise, you'd get pretty greasy before long!
ps. Now you may be thinking: What's a pile? It's a column that can be made of cement and steel, wood, or steel. What's it for? If you're curious, look it up or wait for a future post. Or, look it up and wait for a future post!