Wireless transmitter

This image from the 1926 book 'Television: Seeing by Wireless', written by Alfred Dinsdale, A.M.I.R.E., shows John Logie Baird with his wireless transmitting set at 2T.V. It had a power of 250 watts and a wave length of 200 metres. A copy of the first edition of this book fetched over £10,000 at a Christies auction.