The toynbee.net website speculates that Toynbee refers to Ray Bradbury's short story "The Toynbee Convector". The simple convector models are occasionally seen. In 1923, Reuben Trane invented the convector radiator. The Toynbee Convector is a short story collection by American writer Ray Bradbury. "The Toynbee Convector" is a science fiction short story by American writer Ray Bradbury. Institutional convector heaters are heavy-duty heaters designed strictly for commercial and industrial use. At the same time, it introduced electrical convector heaters and panel heaters (ceramic heaters).