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).
List showing the running time of various upper and lower bearings.
| Identifier | ExFiles\Box 100\1\ scan0079 | |
| Date | 2nd February 1938 guessed | |
| -2- Below is a list showing the running time of the various bearings. Upper Bearings. Silentbloc 2 ran 17½ hrs. 2 ran 11 hrs. 1 ran 13-1/3 hrs. 1 ran 5 hrs. Inlox 1 ran 8 hrs. 20 mins. Lower Bearings. 2 ran 17½ hrs. 2 ran 11 hrs. 1 ran 15 hrs. F.W.Kennington. | ||