The Watford magneto with a thicker cover plate.
| Identifier | ExFiles\Box 70\4\ scan0179 | |
| Date | 8th May 1925 | |
| 8797 RR 68 (250T) (DB {Donald Bastow - Suspensions} 925 8-5-25) J.H.D. EAC.II WATFORD MAGNETO WITH THICKER COVER PLATE. | ||
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).