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 of measurements for near-side front leaf springs.
| Identifier | ExFiles\Box 106\1\ scan0340 | |
| Date | 10th May 1933 guessed | |
| -2- LABELLED NEAR SIDE FRONT. Leaf Index No. | Load flat camber lb. | Defl. flat camber ins. | Length flat camber ins. | Average Thickness of leaf ins. | Length of taper ins. * | Thickness at tip ins. Edge. | Centre. Main | 68 | 3.300 | 38.06 | .177 | .177 | - | - 2 | 118 | 3.550 | 36.0 | .190 | .192 | 1.100 | .100 3 | 111 | 3.048 | 31.56 | .177 | .177 | 1.050 | .080 4 | 184 | 2.644 | 27.81 | .190 | .192 | 1.050 | .103 .085 5 | 226 | 1.990 | 24.69 | .204 | .204 | 1.150 | .107 .080 6 | 174 | 1.556 | 21.44 | .175 | .177 | 1.075 | .066 7 | 219 | 1.268 | 18.69 | .177 | .178 | 1.100 | .064 .050 8 | 294 | 1.100 | 16.19 | .176 | .178 | 1.300 | .080 .072 9 | 384 | .672 | 12.19 | .173 | .176 | 1.225 | .050 10 | 524 | .373 | 8.81 | .175 | .176 | 1.200 | .046 * These are average dimensions of each leaf, the total variation being in some cases as much as .200" | ||