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).
Performance graph comparing supercharged and unsupercharged versions of a Graham-Paige S/C engine.
| Identifier | ExFiles\Box 140\1\ scan0102 | |
| Date | 20th December 1934 guessed | |
| GRAHAM-PAIGE S/C ENGINE SUPERCHARGED UNSUPERCHARGED B.M.E.P B.H.P BOOST PRESS DEPN UNSUPERCHARGED R.P.M. "Hg B.H.P B.M.E.P 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140 2, 4, 6 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000 | ||