The principal showing of the live transmission of pictures was by Georges Rignoux and A. Fournier in Paris in 1909. A network of 64 selenium cells, separately wired to a mechanical commutator, lled in as an electronic retina. In the recipient, a sort of Kerr cell balanced the light and a progression of diversely calculated mirrors joined to the edge of a turning circle examined the adjusted bar onto the showcase screen. A different circuit controlled synchronization. The 8x8 pixel goal in this verication of-idea show was only adequate to plainly send individual letters of the letter set. A refreshed picture was sent "a few times" each second.[17]