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).
Technical document detailing the automatic switching and wiring schemes for Lucas and C.A.V. dynamos.
| Identifier | ExFiles\Box 51\2\ Scan075 | |
| Date | 29th November 1921 | |
| Contd. -3- EFC {E. Fowler Clarke - Electrical Engineer} 2/T29.11.21. In the Lucas case, owing to the cutout having virtually four terminals, the automatic switching takes place on the live side and the negative terminal of the dynamo itself will be earthed to the frame as shown. In the C.A.V. case, however, using a Bleriot cutout, the system will be as arranged for the R.R. Goshawk namely, the automatic switching will take place between the negative of the dynamo and the chassis frame, and therefore the dynamo will be entirely insulated. In each case, however, it is better, as already arranged, to order the dynamos as insulated machines so that either can be used either way, in case it is necessary to change from one make of machine to another on any particular chassis. Wiring. We have a quantity of wire, obtained in connection with the previous R.R. earthed wiring scheme, of three sizes, e.g.:- 1. 40/36's (coloured red) suitable for carrying the smaller currents, e.g. ignition, Klaxon, head, side and tail connections. 2. 70/36's (coloured blue) for carrying the main dynamo and battery currents. 3. 84/25's (coloured black) suitable for the heavy current connections from the battery to the starter switch and from the starting switch to the motor. It will be noted that on the C.A.V. starter switch, provision is made for the attachment of the light current wire from battery to ammeter, but unless this presents a great advantage mechanically in fixing up the wiring scheme, it may Contd. | ||