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).
Experimental record sheet tracking the performance of large diameter tungsten points.
| Identifier | ExFiles\Box 35\6\ scan 293 | |
| Date | 22th January 1926 | |
| X2894 ELECTRICAL EXPERIMENTAL RECORD SHEETS. X. No:- 2894 Large Diameter Tungsten points Date on. | Location. | Date off. | REMARKS. | Miles reading Start. | Miles reading Finish. | Miles covered. | Total miles ---|---|---|---|---|---|---|--- 22-1-26 | 9EX | | Fitted to Expl chassis | 1967 | | | | | | | (Finer Primary GP coil fitted at speedo reading 7153) | | | | 2-3-26. | " | 9EX. | Condition V.{VIENNA} Fair | | 2984 | 1017 | 7-4-26 | " | " | " | | 4034 | 2067 | 30-6-26 | " | | | | 4235 | 2268 | 10-8-26 | " | | Condition Fair | | 5920 | 3953 | 3953 14-9-26 | " | | Bedding on one side - cleaned and reset. | | 7490 | 1570 | 5523 11-10-26 | " | | Condition - Fair | | 7848 | 358 | 5881 8-11-26 | " | | only bedding 25% surface. | | 8324 | 476 | 6357 6-12-26 | " | | Speedometer changed | | 8855 | 531 | 6888 3-1-27 | " | | | 9406 | | | 2-2-27 | " | | Condition-Fair | | 9610 | 204 | 7092 10-3-27 | " | | Fair-only bedding 25% Speedometer changed | | 274 | 664 | 7756 | | | | 0000 | 682 | 408 | 8164 4-4-27 | " | | Condition only Fair. | | 1071 | 1071 | 9235 2-5-27 | " | | | | 1990 | 919 | 10,154 13-6-27 | " | | Trimmed and reset | | 3447 | 1457 | 11,611 7-7-27 | " | | | | 4866 | 1419 | 13,030 22-7-27 | lab | | Removed from chassis | | 5741 | 875 | 13905 | ||