Levavasseur Whistle

Imagine taking the cross section of a standard referee's whistle and the revolving it about an axis to form a toroidal shaped sound cavity - that's what Robert Levavasseur did when he patented this whistle in 1956. Word has it that in testing a giant 6ft version of this type of whistle, the sound was so loud that it ruptured the internal tissues of Levavasseur and two of his colleagues.

This whistle is a little simpler (and smaller) than the version in Levavasseur's patent (http://www.google.com/patents/US2755767). While this version does whistle, I'm sure a lot could be done to optimize the sound. In any case, it will certainly grab the players' attention out on the field!