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 sheet for a Packard spring, detailing deflection measurements under various loads.
| Identifier | ExFiles\Box 127\1\ scan0087 | |
| Date | 23th March 1920 | |
| 23.3.20. PACKARD SPRING - 1100 lbs. (N.S.) No.1 - without clips. Positive camber 7 1/2" cwts. qrs. lbs. | Deflection 3 0 0 | 1" 4 3 14 | 2" 6 3 14 | 3" 8 2 21 | 4" 10 2 0 | 5" 12 1 14 | 6" 14 1 3 | 7" 17 2 0 | 8" 19 0 13 | 8.500" Weight of spring 1 qr. 21 lbs. | ||