The role of the British Broadcasting Corporation (BBC) in supplying television educators with teacher aids, models, and devices is described in this report, which emphasizes the work of special effects or visual effects technicians and explains how difficult concepts and principles can be demonstrated through the use of three-dimensional models, demonstrations, and computer-linked devices. Comparisons are made between educational and non-educational television and the film industry. Additional topics addressed include the organization and history of the departments of visual effects within the BBC, the training of technicians, and the use of visual effects in educational television and the Open University. Examples of models and demonstrations developed are provided, as well as a list of services offered to Open University program developers and discussions of the skills required by the special effects technician; models, model making, and demonstrations; table top models and the new technology, including the use of endoscopes, periscopes, and computer graphics; and uses of visual effects in drama production. (LMM)