Figures taken from a badly worn gear pump tested with Castrol XL oil at 70°C.
| Identifier | ExFiles\Box 104\4\ scan0188 | |
| Date | 5th April 1933 | |
| XS310 To Hdy. {William Hardy} From Ha/m. c. Sg. {Arthur F. Sidgreaves - MD} Wor. {Arthur Wormald - General Works Manager} c. E. {Mr Elliott - Chief Engineer} Da. {Bernard Day - Chassis Design} c. By. {R.W. Bailey - Chief Engineer} Ha/Rm. {William Robotham - Chief Engineer} 2/KT.5.4.33. With reference to your HDY {William Hardy} 3/M27.3.33. We attach figures we have taken off a gear pump which we consider to be badly worn. These figures were obtained with Castrol XL. oil at 70°C. which we think will be as thin as anything we shall use in the gearbox. If you require anything else will you please let us know. Ha/Rm. {William Robotham - Chief Engineer} | ||
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).