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).
Graph plotting compression vs total load for a Woodhead Special Spring D, detailing loading and unloading performance.
| Identifier | ExFiles\Box 54\3\ Scan189 | |
| Date | 28th February 1927 guessed | |
| [ "WOODHEAD SPECIAL SPRING D.{John DeLooze - Company Secretary}", "4 REBOUND LEAVES & CLIPS", "REBOUND LEAVES", "GRADUAL LOADING", "UNLOADING", "INTERNAL FRICTION", "APPROX = 25 LBS.", "COMPRESSION - INCHES", "TOTAL SPRING LOAD LBS." ], | ||