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).
Letter requesting the results of Farnborough tests on Watford and B.T.H. Aero Magnetos.
| Identifier | ExFiles\Box 43\4\ Scan250 | |
| Date | 25th February 1930 | |
| X4021 Lr.{Mr Ellor} from EFC. c. Rg.{Mr Rowledge} EFC5/AD25.2.30. X.4021. X.3832. WATFORD AND B.T.H. AERO MAGNETOS. Referring to your Lr{Mr Ellor}1/H21.2.30, the particular results of Farnborough tests which we should be interested to know are those of high speed and low speed sparking in the fully advanced and retarded positions, under given specified circumstances of H.T. leads, also how these are affected by those circumstances, also any differences of performance between the B.T.H. and the Watford which have been noted as a result of the latter magneto having a smaller H.T. safety gap. EFC. | ||