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).
Calculations for probable tyre loading on vehicle 34E.X.
| Identifier | ExFiles\Box 114\4\ scan0023 | |
| Date | 1st February 1937 guessed | |
| PROBABLE TYRE LOADING 34E.X - 13 Rear Axle Wt. 29 . 0 . 14. 20 Gals Petrol. 1 . 2 . 0 1/2 3 Pass & rations 5 . 2 . 0 . 1 37 . . 14 = 2100 lbs / tyre. @ 15 lbs / sq" /pr.{Percy H. Rose} Lorry tyre area 59 sq" Loading = 36 lbs / sq" (Rm{William Robotham - Chief Engineer}'s hand) | ||