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 NO 83132.
| Identifier | ExFiles\Box 43\4\ Scan149 | |
| Date | 19th April 1926 | |
| ELECTRICAL EXPERIMENTAL RECORD SHEETS X4021 X.&No:- 4021 Watford aero magneto type IS12 NO 83132 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 | " | 25-8-27 | Production tested & sparking advanced. 25-8-27 | Messrs. North's | | Returned to North's for modification. 28-12-27 | lab | | Received back. Tested preliminarily on bench. 3-1-28 | " | | Returned upon request to Air Ministry 19.4.26. | ||