a good book about vortices
http://books.google.com.au/books?id=j6qE7YAwwCoC&pg=PA401&lpg=PA401&dq=the+vortex+is+more+obvious&source=bl&ots=S990EoImlm&sig=f7mOlGUG4fjvQdN6q1RQy0DKJz4&hl=en&sa=X&ei=i6hiT-CuKcqIrAeHiY29Bw&ved=0CDcQ6AEwAw#v=onepage&q=the%20vortex%20is%20more%20obvious&f=false
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