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).
Graph comparing depression in the induction pipe versus engine RPM for a Lorraine-Dietrich engine and a 20HP R.R. engine.
| Identifier | ExFiles\Box 5a\5\ 05-page023 | |
| Date | 21th March 1927 | |
| LORRAINE-DIETRICH ENGINE DEPRESSION IN INDUCTION PIPE. 21-3-27 DEPRESSION IN INDUC' PIPE (INCHES OF MERCURY). R.P.M. OF ENGINE 20 HP R.R. LORRAINE ⑥ | ||