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).
List of Watford Aero Magnetos, detailing their type, serial numbers, and status.
| Identifier | ExFiles\Box 43\4\ Scan187 | |
| Date | 29th October 1929 | |
| X. 4021. 29.10.29. WATFORD AERO MAGNETOS. Type No. (R.H.) No. (L.H.) Remarks. I.S.12 (old type) 83134 Obsolete type I.S.12 83135 " I.S.12 83136 83137 " SP.{Mr Spinney}12-1 83120 83119 Modified magnetos in new condition. I.S.12 83132 83133 Modified magnetos in new condition. " 98034 98033 Used for type test, require reconditioning. SP.{Mr Spinney}12-5 98087 98089 Used on R.{Sir Henry Royce} engine No.3 " 98088 98090 Received for R.{Sir Henry Royce} engine not been used. EFC. | ||