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).
Data table listing various figures, sides, and their corresponding stroboscopic speeds.
| Identifier | ExFiles\Box 79\1\ scan0255 | |
| Date | 23th October 1917 | |
| H.R. 288 A (770 H) S.D. 442. 9-5-17) G 1965. X.2720 23.10.17. X.2720 - STROBOSCOPIC SPEEDS Figure. Sides round. Speed. 5 1 990 4 1 1237.5 7 2 1414 3 1 1650 8 3 1856 5 2 1980 7 3 2122 (4 6 8) {2 3 4} 2475 7 4 2829 5 3 2970 8 5 3094 | ||