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 plotting the results of a torsional oscillation test on a B.60 engine with various damper configurations.
| Identifier | ExFiles\Box 134\2\ scan0202 | |
| Date | 16th February 1939 guessed | |
| TORSIONAL OSCILLATION TEST ON B.60 B.60 DAMPER SET AT 219 LBS FT/DEGREE B.60 WITHOUT DAMPER STUDEBAKER DAMPER STUDEBAKER DAMPER WITH INCREASED INERTIA STANDARD WRAITH ENGINE R.P.M. AMPLITUDE DEGREES RM{William Robotham - Chief Engineer}(522) | ||