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).
Table of minimum and maximum shock damper governor control pressures at different speeds.
| Identifier | ExFiles\Box 95\4\ scan0091 | |
| Date | 18th April 1937 | |
| 342. PR/M 37 EX SHOCK DAMPER GOVERNOR CONTROL PRESSURES. SPEED. | MIN. | MAX. 10 mph. | 0 lbs/ sq. in. | 25 lbs/sq. in. 20 | 0 | 27 30 | 1/2 | 28 1/2 40 | 1 | 29 1/2 50 | 3 | 30 60 | 5 | 32 70 | 8 | 33 80 | 10 | 35 18.4.37. Rm{William Robotham - Chief Engineer}/LES.{Ivan A. Leslie} | ||