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 data for a Packard rear spring showing deflection under various loads.
| Identifier | ExFiles\Box 127\1\ scan0091 | |
| Date | 23th March 1920 | |
| 23.3.20. PACKARD SPRING. 1100 lbs.(REAR) No.3 - without clips. Positive camber 5½ cwt. qrs. lbs. Deflection. 4 0 0 1" 7 1 24 2" 10 3 6 3" 14 0 24 4" 17 2 22 5" 21 2 14 6" 24 1 24 6.500" Weight of spring - 1 qr. 3 lbs. | ||