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).
50% improvement derived from an Autovac modification using an experimental elbow.
| Identifier | ExFiles\Box 40\4\ Scan146 | |
| Date | 18th November 1925 | |
| X3579 PN{Mr Northey}1/DN18.11.25. TO Hs{Lord Ernest Hives - Chair} FROM PN{Mr Northey} Re Autovac modification. It is considered that the improvement derived from fitting the experimental elbow is in the neighbourhood of 50%. P.N. | ||