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 different configurations of a Graham supercharger on a Bentley engine.
| Identifier | ExFiles\Box 140\1\ scan0113 | |
| Date | 12th December 1934 | |
| GRAHAM SUPERCHARGER ON BENTLEY B.V. 64 UNIT:- B12 SPECIFICATION:- RHC{R. H. Coverley - Production Engineer}/CP /EP{G. Eric Platford - Chief Quality Engineer} 12.12.34 COMPRESSION RATIO:- 6.54:1 NO WASHER BETWEEN HALVES OF ROTOR CASING ① 1 7/8 S.U. CARB. LONG INTERMEDIATE PIPE. COLD WATER TO ROTOR CASING. ② 1 7/8 S.U. CARB. SHORT INTERMEDIATE PIPE. NO HEAT TO ROTOR CASING. HOT WATER TO JACKET OF INTERMEDIATE PIPE. ③ 1 7/8 S.U. CARB. LONG INTERMEDIATE PIPE. HOT WATER TO ROTOR CASING. ④ 1 7/8 S.U. CARB. AS SEMI-EXPANDING CARB. ORIGINAL LONG INTERMEDIATE PIPE. HOT WATER TO ROTOR CASING. BOOST PRESSURE (INS. MERCURY) POSITIVE NEGATIVE R.P.M. | ||