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).
List of Bentley speedometer calibration results as determined by the Test Department.
| Identifier | ExFiles\Box 59\2\ Scan255 | |
| Date | 13th October 1933 guessed | |
| BENTLEY SPEEDOMETER CALIBRATIONS AS DETERMINED BY TEST DEPT. Chassis No. Instrument No. Calibration. B1 AE G.907 5% fast 60 M.P.H. 3 G.971 " " " " 5 G.997 6% " " " 7 G.991 5½% " " " 9 G.982 6% " " " 11 H.5 6% " " " 13 15 G.908 5% " " " 17 G.905 " " " " 19 G.994 6% " " " 21 H.20 5% " " " 23 G.909 " " " " 25 G.972 6% " " " 27 H.6 6% " " " 29 G.906 6% " " " 31 H.17 6% " " " | ||