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).
Equilibristat diagram showing main line express train performance and oscillations at different speeds.
| Identifier | ExFiles\Box 113\2\ scan0017 | |
| Date | 14th November 1922 guessed | |
| 39 M P H 25 26 27 2 4 75 130 160 200 400 22 42 150 110 47 1/2 M.P.H. 16 17 2 4 6 20 170 Fig. 7.—Equilibristat diagram.—Main line express. (The upper line gives speed in miles per hour. The line just above the arrow is mileage. The oscillations curve is that given by the instrument. The lowest line gives the lay-out of the railway, the figures being radii of curvature in chains.) | ||