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 aero magneto type IS12 N083133.
| Identifier | ExFiles\Box 43\4\ Scan150 | |
| Date | 19th April 1926 | |
| X4021 ELECTRICAL EXPERIMENTAL RECORD SHEETS X.&No.:- 4021 Watford aero magneto type IS12 N083133 Date on. | Location. | Date off. | REMARKS. | Miles reading Start. | Miles reading Finish. | Miles covered. | Total miles. --- | --- | --- | --- | --- | --- | --- | --- 3-2-27 | Lab | | Received from makers fitted with new (rubber base) distributor. 12-2-27 | " | 24-2-27 | Production tested. bad sparking advanced. 24-2-27 | X710 | 18-3-27 | Fitted to X710. 29-3-27 | Lab | 25-8-27 | Returned to lab. 25-8-27 | Messrs North's | | Returned to North's for modification. 28-12-27 | Lab | | Received back. 3-1-28 | " | | Tested preliminarily on bench. | | | Returned upon request to Air Ministry. 19.4.26. | ||