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).
Technical graph, labeled Fig. 5, showing a plotted curve on a grid with various annotations and measurements.
| Identifier | ExFiles\Box 113\2\ scan0175 | |
| Date | 21th November 1931 guessed | |
| Fig. 5, 0, 15, 30, 45, 60, 75, 90, 60 m/m, 30 m/m, 3 m/m, 1 1/2 m/m, 1/2, 1, 1 1/2, 2, 2 1/2, 3, 3 1/2, 4, A, B, C, D, E, F, G, H, J, K, L, M, N, O, P, R, S, 1°, 2 1/2°, 3 1/2°, 17 R.P., 18 R.P., 19 R.P., 20 R.P. | ||