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).
Photographic record of Wraith III No.2 main bearings after endurance testing.
| Identifier | ExFiles\Box 97\1\ scan0138 | |
| Date | 23th March 1938 guessed | |
| WRAITH III No.2. MAIN BEARINGS. White Metal R.R. 56 Shims. Rear has run 46 hrs. endurance. Other main bearings 68 hrs. endurance making a total of 190 hrs. on test bed plus 1700 miles on road. | ||