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).
The mileage tests of bone grey fibre rubbing blocks.
| Identifier | ExFiles\Box 69\1\ scan0356 | |
| Date | 28th October 1924 | |
| X.4646. To EFC3/T28.10.24. X.4646. MILEAGES OF BONE GREY FIBRE RUBBING BLOCKS TO DATE. 1st Sample. 3841 miles on 6-GII. 1st.Sample. on 98-NK in France - 2nd.Sample. 2876 miles on 5-EX. EFC. | ||