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 a Watford EWG magneto, tracking testing and modifications.
| Identifier | ExFiles\Box 65\3\ scan0303 | |
| Date | 12th May 1928 | |
| X7791. Watford EWG magneto No 105302. ELECTRICAL EXPERIMENTAL RECORD SHEETS. Date on. | Location. | Date off. | REMARKS. | Miles reading start. | Miles reading finish. | Miles covered. | Total miles. 26-1-28 | lab | | Received from makers 9-2-28 | MX{John H Maddocks - Chief Proving Officer} | | Handed to MX.{John H Maddocks - Chief Proving Officer} for test reported OK. 18-2-28 | lab | | Placed on Bench test rig and run at 1450 rpm for 125 hrs. | | | Bench 3475 | 8-3-28 | " | | Run for 312 hrs at 2900 rpm. | | | 17300 | Bench 20775 3-5-28 | " | | Dismantled and examined. Found to be OK. 12-5-28 | North's | | Returned to Messrs North's for modification. Received back. Handed over to production | ||