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).
Comparison of the Watford I.S.12 magneto against the standard B.T.H. machine regarding interchangeability.
| Identifier | ExFiles\Box 43\4\ Scan305 | |
| Date | 25th October 1930 | |
| X4021 Rg{Mr Rowledge}/SFP. from EFC. EFC1/AD25.10.30. X.4021. WATFORD IS.12 MAGNETO IN PLACE OF B.T.H. MACHINE. Answering your Rg{Mr Rowledge}/SFP4/ME24.10.30 there is no difference in the main H.T. wires of the I.S.12 magneto compared with the standard B.T.H. The only difference is in the hand starting H.T. wire which in the I.S.12 comes out of the top of the distributor, whereas in the B.T.H. this emerges at the bottom. The length of cable is the same so that interchangeability, except as regards the controls, would be complete. EFC. | ||