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 No.2 Packard Spring (O.S.) with clips, showing deflection under various loads.
| Identifier | ExFiles\Box 127\1\ scan0089 | |
| Date | 23th March 1920 | |
| 23.3.20. PACKARD SPRING(O.S.) No.2 - with clips. Positive camber 7.687 cwts. qrs. lbs. Deflection. 3 0 10 1" 5 0 0 2" 7 1 21 3" 9 1 5 4" 11 1 21 5" 13 1 14 6" 15 2 14 7" 19 0 7 8" 20 0 14 8.687" | ||