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).
List detailing the weights of various valves for J.III type dampers.
| Identifier | ExFiles\Box 107\4\ scan0124 | |
| Date | 23th January 1933 | |
| X4538. Copy for files. 23.1.33. X5520. WEIGHT OF THE VALVES FOR J.III TYPE DAMPERS. Steel with alum damping disc F.59306 = 12.95 grms. All steel F.100695. = 18.6 grms. All steel lightened Hs.{Lord Ernest Hives - Chair}909. = 14.2 grms. All duralumin lightened Hs.{Lord Ernest Hives - Chair}909. - 5 grms. Hs{Lord Ernest Hives - Chair}/Les.{Ivan A. Leslie} | ||