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 of load in pounds versus deflection in inches for a detachable type servo spring plate.
| Identifier | ExFiles\Box 99\3\ scan0201 | |
| Date | 16th February 1939 | |
| SERVO SPRING PLATE DETACHABLE TYPE PHOSPHOR BRONZE .014" THICK .012 THICK ORDERED FREE LENGTH 1.10" LBS. LOAD DEFLECTION INCHES. 16 . 2 . 39 | ||