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 of a Graham Supercharger on a Bentley, comparing boost temperature against RPM under different configurations.
| Identifier | ExFiles\Box 140\1\ scan0115 | |
| Date | 12th December 1934 | |
| GRAHAM SUPERCHARGER ON BENTLEY B.V. 66 UNIT - B.12 SPECIFICATION RHC{R. H. Coverley - Production Engineer}/C.P. 1/EP{G. Eric Platford - Chief Quality Engineer} 12-12-34 COMPRESSION RATIO 6.64 : 1 NO WASHER BETWEEN HALVES OF ROTOR CASING NORMAL TEST HOUSE TEMPERATURE 17°C ① 1 7/8 S.U. CARB. ORIGINAL 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. ORIGINAL 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 TEMPERATURE (DEGREES CENTIGRADE) R.P.M. | ||