It is well known that Bosanquet invented the googly 
around 1900, but does anyone know who first used the 
flipper?

samarth harish shah:
  Clarrie Grimmett. In fact, he also "faked" his flipper, 
  sometimes. He would bowl an ordinary flighted ball and 
  snap the fingers of his _LEFT_ hand. The batsmen in those 
  days, going purely by the sound, would play for the flipper 
  and be beaten all ends up by the turn.

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