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).
Blueprint for a special full-size thermometer selecting switch and temperature gauge.
| Identifier | ExFiles\Box 175\4\ img130 | |
| Date | 1st May 1931 | |
| Thermometer Selecting Switch, Tapp, Full SIZE, TEMPERATURE, SPECIAL, MAY 1931 | ||