Much debate about this one:
"The issue of 'who invented television?' will probably never be answered to everyone's satisfaction. Each country believed they have their own televison pioneer(s). People in the US believe it was Jenkins or Farnsworth. The Japanese believe it was Takayanagi. In Russia it was Boris Rosing. In France it was Belin and Barthelemy. Eastern Europe, von Mihaly. Germany, Karolus. In the UK we have the choice of Campbell-Swinton for concept and Baird for practical demonstration."
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I think though that Farnsworth first demonstated on Sep 10th 1928 and Baird first demonstrated pictures in 1924.