Daphne Oram at the north-west end of Room 13. The equipment consists of a Muirhead Decade Oscillator (an accurate laboratory oscillator), a Muirhead sine-wave to square-wave converter, B&K wobbulator, a PEU, an unknown box and a tape recorder. Note the slide rule and stopwatch on the desk. The prominent NO SMOKING sign is essential because of the flammability of the film that's viewed and edited in the area. Earlier nitrate films were especially dangerous.