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 large diameter tungsten contact points.
| Identifier | ExFiles\Box 35\6\ scan 201 | |
| Date | 6th October 1925 | |
| X 2894 ELECTRICAL EXPERIMENTAL RECORD SHEETS. X. No:- 2894 Large Dia Tungsten Contact points Date on. | Location. | Date off. | REMARKS. | Miles Reading Start. | Miles Reading Finish. | Miles covered. | Total Miles 6-10-25 | 98NK | | Fitted to 98NK | 8042 | | | 1-12-25. | " | | Screw contact replaced by one with domed surface to ensure central contact | 1160 | | | 29-12-25 | " | | Examined - condition good | | 1569 | 409 | 30-1-26 | ~ | | Fair | | 1717 | 557 | 8-2-26 | ~ | | Points fitted-trimmed to correct timing. | | 1997 | 837 | 2-3-26 | " | | Points dirty. | | 2771 | 1611 | 8-4-26 | " | | Condition now good. | | 3765 | 2605 | 4-5-26 | ~ | | Rather duty again. | | 4682 | 3522 | 3-6-26 | " | | Condition fair - distributor oily. Points changed for new tungsten points owing to misfiring etc | | 5798 | 4638 | 5416 30-6-26 | | | | | 6560 | | 2-8-26 | ~ | 8-9-26. | Condition V.{VIENNA} Fair | | 6639 | 79 | 79 10-8-26 | | | | | 8592 | 2032 | 2032 8-9-26 | Lab. | | Points removed and replaced by platinum. Condition on removal Fair - only bedding 25%. | | 9418 | 826 | 2858 | ||