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 sample.
| Identifier | ExFiles\Box 69\1\ scan0370 | |
| Date | 21th October 1924 | |
| ELECTRICAL EXPERIMENTAL RECORD SHEETS 13 Bone grey fibre rubbing block NO T3 (2nd Sample) X No. 4646 Date on. | Location. | Date off. | REMARKS. | Miles reading start. | Miles reading finish. | Miles covered. | Total miles. 24-10-24 | lab | 15-12-24 | Dimensions (run unlubricated for 10000mls) .250 top .250 middle .252 bottom Dimensions after running .247 top .246 bottom. | 0 | | 10,000 | 8-1-25 | lab | 2-3-25 | Run lubricated 10,000 mls Dimensions before {.258" top, .257" bottom} Dimensions after {.256" top, .256" bottom} | 10000 | | | 20000 21.10.24. X 4646 | ||