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).
Laboratory report on the hardness, composition, and micro-structure of B14 Bentley Endurance Bearings.
| Identifier | ExFiles\Box 115\1\ scan0037 | |
| Date | 23th June 1936 | |
| X1020 To Rm.{William Robotham - Chief Engineer}/Exptl. c. Mr Swindell. HL1/AG.23.6.36. Laboratory. Re: B14 Bentley Endurance Bearings after 100 hrs. AC.7 Alloy. Hardness 48 to 56 Br.{T. E. Bellringer - Repair Manager} This has probably increased owing to running, particularly in the case of the "big ends". As fitted Br.{T. E. Bellringer - Repair Manager} was usually 43 to 50. The composition is within specification. The micro-structure is normal. Swdl{Len H. Swindell}- what was the condition of these bearings? Rm{William Robotham - Chief Engineer} Hl. JHC | ||