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).
Query regarding the optimal ratio of drum thickness to ribbed height.
| Identifier | ExFiles\Box 120\2\ scan0124 | |
| Date | 25th November 1936 | |
| 1029. AFM.{Anthony F. Martindale} from Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}11/R.25.11.36. Have our present drums the best ratios of thickness to ribbed height that we know of ? Rm.{William Robotham - Chief Engineer} | ||