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 for the testing of larger diameter tungsten points.
| Identifier | ExFiles\Box 35\6\ scan 160 | |
| Date | 14th December 1925 | |
| ELECTRICAL EXPERIMENTAL RECORD SHEETS. X. No:- 2894 Tungsten points (LD) Larger diameter Date on | Location | Date off | REMARKS | Miles reading Start. | Miles reading Finish. | Miles covered. | Total Miles 6-10-25 | 8 EX | | Fitted to 8 EX for test | 554 | | 14-12-25 | Completed 10000 miles running in France OK. Handed to E.F.C by W. Hancock. Reported pitting towards end of run but did not affect working of ignition | | | 10000 Side note: X. 2894 | ||