Photograph of twelve upper half big end bearings after a 42-hour endurance test.
| Identifier | ExFiles\Box 114\2\ scan0187 | |
| Date | 21th September 1935 guessed | |
| UPPER HALVES <-- 1 TO 6 --> B-16 Unit. 6.8:1 Comp.Ratio. Hall's metal big end bearings after 42 hrs. 30 mins. endurance as follows:- 1st 30 hrs. at 4,000 r.p.m. full throttle. Following 12 1/2 hrs. as follows for each hour:- 30 mins. at 4,000 r.p.m: full throttle. 25 " " 4,250 " " " 5 " " 4,500 " " " | ||
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).