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).
Test log sheet for an HT ignition wiring sandwich system.
| Identifier | ExFiles\Box 52\1\ Scan115 | |
| Date | 19th November 1929 | |
| X4473. ELECTRICAL TEST SHEET Item: HT ignition wiring sandwich system of "Maconite" "Super Glover" & "Helsby" | Date on. | Location. | Date Off. | REMARKS. | Miles Start. | Miles reading Finish. | Miles cover | Total Miles. | |------------|-----------|-----------|------------------------------------------------------------------------------------------------------|--------------|-----------------------|-------------|--------------| | 25-5-29 | 18EX | | Fitted to 18EX. | 17980 | | | | | 5-6-29 | " | | Car at West WitteringHenry Royce's home town | | 18400 | 420 | 420 | | 17-9-29 | " | | Speedometer changed | 00012 | 20353 | 1953 | 2373 | | 19-11-29 | " | | Wires removed and returned to lab. Examined, found to be in good condition except where wires pass exhaust pipe. | | 5870 | 5858 | 8231. | | ||