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).
Graph comparing the performance of various engine dampers at different engine speeds.
| Identifier | ExFiles\Box 124\1\ scan0279 | |
| Date | 30th November 1939 guessed | |
| B.60 N° 3 NORMAL DRIVE B.60 DAMPER, TORQUE 210 LBS/DEGREE. B.60 N° 1 CHAIN DRIVE B.60 DAMPER TORQUE 210 LBS FT/DEGREE. B.60 N° 3 CHAIN DRIVE. HUMBER SNIPE DAMPER FRICTION TORQUE 50 LBS. INS. x x x x B.60 N° 1. CHAIN DRIVE. STUDEBAKER DAMPER 45/50 RUBBERS. AMPLITUDE DEGREES. ENGINE R.P.M. RM{William Robotham - Chief Engineer}/VRS. | ||