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).
Standardisation of a water boiling indicator thermometer that operates a red warning light.
| Identifier | ExFiles\Box 175\4\ img052 | |
| Date | 21th October 1926 | |
| To C. from Hs.{Lord Ernest Hives - Chair} Y3875 Hs{Lord Ernest Hives - Chair}1/LG21.10.26. WATER BOILING INDICATOR. The thermometer arranged to operate a red warning light when the water boils has been standardised. No more present type thermometers will be ordered and existing stock will be used up. Hs.{Lord Ernest Hives - Chair} | ||