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 Supercharger on a Bentley engine, plotting Boost Pressure against RPM under three test conditions.
| Identifier | ExFiles\Box 140\1\ scan0114 | |
| Date | 12th December 1934 | |
| GRAHAM SUPERCHARGER ON BENTLEY B.V. 65 UNIT: B12 SPECIFICATION R.H.C./C.P. 1/EP{G. Eric Platford - Chief Quality Engineer} 12.12.34 COMPRESSION RATIO: 6.64:1 ① GRAHAM CARBURRETTER ORIGINAL LONG INTERMEDIATE PIPE COLD WATER TO ROTOR CASING, NO WASHER BETWEEN HALVES OF ROTOR CASING ② AS ① BUT WITH HOT WATER TO ROTOR CASING ③ AS ② BUT WITH WASHER BETWEEN HALVES OF ROTOR CASING Y-AXIS: Boost Pressure (Ins. Mercury), POSITIVE, NEGATIVE X-AXIS: R.P.M. | ||