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).
Test results and data from separate leaf spring tests, including camber and load measurements.
| Identifier | ExFiles\Box 106\1\ scan0344 | |
| Date | 25th April 1933 guessed | |
| -2- In testing each leaf separately, flat camber was assumed when the centre of the leaf was level with the ends, actually the leaf took a slightly waved form. The clips prevented measurements of the tapers being taken, therefore assuming the inner edges of theclips to be level with the limit of the tapered sections in each case, the length of taper was 1.875" the clips being 1" wide. The information stamped on the serial plates of the springs was :- | | | K.1983. | K.1982 | | :--- | :--- | :--- | :--- | | | Firths serial No. | | | | Plates | Piece No. | F.57900 | F.57900 | | | Normal Poundage | 750 lb. | 750 lb. | | | Actual Poundage | 759 lb. | 760 lb. | | Other information from tests. | Free camber-Natural | 4.325 | 4.450 | | | " " - on Rig | 4.300 | 4.325 | | | Camber at actual poundage | .110 | .090 | | | Load at flat camber-on rig | 790 lb. | 790 lb. | | | Cts.{C. Trot Salt - Carburation} of eyes-flat camber. | 38" | 38" | | | Shackle end to centre bolt | 18" | 18" | | | Fixed end to centre bolt | 20" | 20" | W. Bell. | ||