leonardo da vinci : the codex leicester

what causes cyclones?

when two air streams collide such that their respective lines of movement produce an obtuse angle as soon as they meet, then the two storms circle around each other and form a column. this air in the form of a column becomes heavier and hence also acquires the ability to move objects with less weight, which normally could not be moved by air alone. this is the case, for instance, when such a column of air strips away an area of sandy soil, so that the sand, stones and seaweed are tossed through the air. if the column then rises over the sea, everything mixes with the swirled up water and becomes a column of thick air.






  1. why does something move?
  4. why does a body move when something strikes it?
  12. where does the wave break?
  13. what causes cyclones?
  15. what must an especially strong dam look like?
  16. how can one simulate the collapse of a wave?

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