Shortly after his practical demonstration of black and white television, on July 3, 1928, Baird demonstrated the world's first color transmission. This used scanning discs at the transmitting and receiving ends with three spirals of apertures, each spiral with filters of a different primary color; and three light sources, controlled by the signal, at the receiving end, with a commutator to alternate their illumination. The demonstration was of a young girl wearing different colored hats. The girl, Noele Gordon, later became a TV actress in the soap opera "Crossroads". Baird also made the world's first color over-the-air broadcast on February 4, 1938, sending a mechanically scanned 120-line image from Baird's Crystal Palace studios to a projection screen at London's Dominion Theatre. Previous color television demonstrations in the U.K. had been via closed circuit.</ref>