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).
Bentley (28 B.H. Unit Trials Car) bearings which are standard Hall's AC7 metal, after 22,000 miles running.
| Identifier | ExFiles\Box 97\1\ scan0032 | |
| Date | 27th November 1936 guessed | |
| (BENTLEY) (28 B.H. UNIT TRIALS CAR) BEARINGS WHICH ARE STANDARD HALL'S AC7 METAL AFTER 22,000 MILES RUNNING. NO.2. BIG END BEARINGS IN POOR CONDITION PRESUMED TO BE BREAKING OFF OF LINER FACING. 11 | ||