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).
Test results for bone grey fibre samples run on different chassis.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan8 | |
| Date | 17th June 1925 | |
| Contd. -6- EFC3/T1.7.25. Test No.16. 17.6.25. Bone grey fibre (second sample) Run on chassis GF.68 and 8-GIII for 10,090 miles under normal chassis conditions. Maximum wear .012" Test No.18. 17.6.25. Bone grey fibre (second sample). Run on chassis 93-NK for considerably over 10,000 miles under normal conditions. Maximum wear .006" EFC. | ||