Photographs comparing different types of thermostats and their components, including 'Type K', 'Type G', and 'Type B'.
| Identifier | ExFiles\Box 149a\3\ scan0148 | |
| Date | 30th July 1935 guessed | |
| Our new Thermostat Type. K Type. K Type. G Type. B | ||
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).