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).
Diagram of a Change Speed Mechanism showing deflection measurements in inches.
| Identifier | ExFiles\Box 15\5\ Scan009 | |
| Date | 8th July 1926 guessed | |
| DEFLECTION IN INCHES .0015 | .0035 | .006 | WHEN BINDING .001 | .0025 | .003 | LIGHT LOAD CHANGE SPEED MECHANISM. ARRGT DRG: G.74299. | ||