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).
Telephone message about the specifications of a new Watford aero engine magneto.
| Identifier | ExFiles\Box 43\4\ Scan105 | |
| Date | 22th December 1927 | |
| X4021 22.12.27. WATFORD AERO ENGINE MAGNETO. Yesterday we had a telephone message from Mr. North that they had determined that they could give a 30° range on the new magneto which they are making up, keeping the fully advanced position the same in relation to the magneto, i.e. giving 15° extra retard. The low sparking speed in the retarded position is not seriously increased. EFC. | ||