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 the induction pipe depression of a Lorraine-Dietrich engine against a 20 HP R.R. engine.
| Identifier | ExFiles\Box 22\4\ Scan103 | |
| Date | 21th March 1927 | |
| 6 LORRAINE-DIETRICH ENGINE DEPRESSION IN INDUCTION PIPE 21-3-27 Y-Axis: DEPRESSION IN INDn. PIPE (INCHES OF MERCURY) X-Axis: R.P.M. OF ENGINE Data Line 1: 20 HP R.R. Data Line 2: LORRAINE. | ||