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What has Euler got on his head here?

  1. Mar 18, 2014 #1
    This is a very well-known portrait of Leonhard Euler, which I'm sure most people have seen before, but does anyone know what the heck he's wearing on his head?

    http://upload.wikimedia.org/wikipedia/commons/d/d7/Leonhard_Euler.jpg

    It looks like someone threw a dirty old rag on him - does anyone know what the name of that headwear is, and what kind of function it serves?
     
  2. jcsd
  3. Mar 18, 2014 #2

    dlgoff

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  4. Mar 18, 2014 #3
  5. Mar 20, 2014 #4
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