A flight simulator in use at RAF Lyneham, Wiltshire. Before computers, flight simulators used actual models of different airfields in order to train pilots. The model used here was of the RAF base on Gan Island in the Indian Ocean. A colour TV camera relayed a picture of the scale model to a screen in the mock up of a Hercules Transport aircraft. Detail on the model was so precise that final work had to be carried out under a magnifying lens.