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).
Electrical experimental record sheet for a Bone Grey Fibre rubbing block test sample.
| Identifier | ExFiles\Box 69\1\ scan0361 | |
| Date | 12th June 1924 | |
| ELECTRICAL EXPERIMENTAL RECORD SHEETS. X 4646 Bone Grey Fibre rubbing block (1ST sample) Date on. | Location. | Date off. | REMARKS. | Miles reading start. | Miles reading Finis[h]ed.{J. L. Edwards} | Miles covered. | Total miles. 20-8-24 | 6 GII | | Dimensions before running top .257" Bottom .255" | 9175 | 1992 | 2817 | " | " | 19-6-25 | New Speedometer | 8265 | 7687 | 9422 | 12239 19-6-25 | lab | | Dimensions after running .253 top .253 bottom | | | | | | | Max wear .004" | | | | X.4646 14 12.6.24. | ||