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).
Comparison of specifications for the Standard and Thermostat type 20 HP radiator.
| Identifier | ExFiles\Box 107\4\ scan0059 | |
| Date | 3rd April 1924 | |
| To Hs.{Lord Ernest Hives - Chair} from THM. 4538 Hs{Lord Ernest Hives - Chair}/THM/3.4.24. 20 HP. RADIATOR. X4240 Standard. Tubes 3.95" long. Weight 67 lbs. 2 ozs. Thermostat type. Tubes 3.5" long. Weight 63 lbs. 14 ozs. Hs{Lord Ernest Hives - Chair}/THM. | ||