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 for a Graham-Paige S/C engine, comparing supercharged and unsupercharged configurations.
| Identifier | ExFiles\Box 140\1\ scan0106 | |
| Date | 31th December 1934 guessed | |
| GRAHAM-PAIGE S/C ENGINE SUPERCHARGED UNSUPERCHARGED B.H.P. & B.M.E.P B.M.E.P B.H.P "Hg BOOST PRESS. DEPN UNSUPERCHARGED R.P.M. 140 130 120 110 100 90 80 70 60 50 40 6 4 2 500 1000 1500 2000 2500 3000 3500 4000 | ||