http://www.a516digital.com/2016/08/bbc- ... l?spref=tw
With no surviving recordings of the first night of television, the BBC Four team will attempt to piece back together and recreate every aspect of the show from scratch - from the variety acts to the cameras - using the original technology and filming techniques to capture the excitement of the day.
The system that went first on opening night, which is due to be recreated for the programme, was a seven-feet tall mechanical monster built by John Logie Baird’s company. It was called the 'Flying Spot' and at its heart was a huge steel disc spinning almost at the speed of sound.