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).
'Goshawk' electrical system, its switchbox, and ignition circuits.
| Identifier | ExFiles\Box 51\2\ Scan021 | |
| Date | 19th September 1921 | |
| To R. {Sir Henry Royce} from EFC. {E. Fowler Clarke - Electrical Engineer} c. to SJ. c. to Ba. c. to Hy. {Tom Haldenby - Plant Engineer} X4338 X.4328 - "GOSHAWK" ELECTRICAL SYSTEM. We have received a print No.Sch.949 giving two diagrams of electrical circuits for the "Goshawk II". I do not know exactly how the two switches in the switchbox have been arranged, but so far as I can judge, each of these switches on in two stages, the left hand switch switching on the side and tail lamps on the first contact, afterwards switching on the head lamps on the second contact; the right hand one switching on the ignition on the first contact and the dynamo in addition on the second contact. This is not, however, quite clear, because on the left hand diagram, the second switch is shown as a switch which, in one operation, connects four points together. If this latter is correct, then it seems that it is impossible to switch on the battery ignition without at the same time switching on the dynamo. A fuse is shown in the wire connecting one point of this switch to the battery positive, but no dynamo field fuse is provided. When this fuse is removed or melted, then without a magneto ignition the car could not be started. If, on the other hand, this fuse melts or becomes disconnected for any reason while travelling along the road, it is possible for the battery ignition to be operated direct from the | ||