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).
Index of files concerning V. tubes, a new 25 HP design, and broken parts.
| Identifier | ExFiles\Box 103\5\ scan0130 | |
| Date | 5th May 1931 guessed | |
| x5600. FILES. x7600. V.{VIENNA} tubes for 25 HP. N.S.3300. V.{VIENNA} tubes for P.II. N.S.3303. Latest design for 25 HP. N.S.3356. Parts that have been broken on the bump. N.S.3322. Hs{Lord Ernest Hives - Chair}/Les.{Ivan A. Leslie} | ||