A clothes drier control circuit includes an electric heater regulated to maintain a constant predetermined temperature difference between the outlet and the ambient air. A digital reference value is stored representing the constant heat output level when a constant rate of evaporation is reached. The...http://www.google.com.au/patents/US4209915?utm_source=gb-gplus-sharePatent US4209915 - Control arrangements for clothes driers and clothes driers including such control arrangements
