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 a switchbox with an armature contact in the ignition position.
| Identifier | ExFiles\Box 65\2\ scan0061 | |
| Date | 28th November 1929 | |
| X7730. ELECTRICAL EXPERIMENTAL RECORD SHEET Rate:- X 7730 Switchbox with armature contact in ignition position Date on. | Location. | Date off. | REMARKS. | Miles reading Start. | Miles reading Finish. | Miles covered | Total miles. 28. Nov '29 | Lab | Recd shop. | Tested OK | For R. {Sir Henry Royce} 6. Dec " | 18 EX | With dist-bd {Mr Berend} with B&C exchanged. | | | 6362 | 0 | 0 21. May '30 | " | No complaints | | | 17833 | 11471 | 11471 7. June '30 | " | OK | | | 18479 | 646 | 12117 27. Nov '30 | " | OK | | | 20028 | 1549 | 13666 3 Dec '30 | Off. | Replaced by half-charge type. | Concluded. | ||