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).
Trial arrangement of a No.2 scheme sequence starter, comparing its advantages over the No.1 scheme.
| Identifier | WestWitteringFiles\Q\2April1927-June1927\ 95 | |
| Date | 10th May 1927 | |
| To R.{Sir Henry Royce} from EFC. c.c. BJ. ORIGINAL EFCd/T10.5.27. x7625 x7650 SEQUENCE STARTER. Further to our EFC4/T7.5.27, and in more detailed answer to your R2/M3.5.27, the arrangement for trial of the No.2 scheme sequence starter on the car has, in the absence of the very latest design of duplex switch unit, been arranged with the combined main and relay switch unit and three-point push button switch which was utilised with the motor and solenoid actuator on the No.1 scheme. This switching apparatus was already on the car, and so far as we have gone it has proved itself to be satisfactory, the defects of the system lying entirely in the motor, solenoid pinion actuator and pinion operated switch. Calling this switching apparatus the top portion, it may be seen that the top portion of the No.1 scheme is directly applicable to the lower portion of the No.2 scheme, the connection between the two being by means of the four wires coloured black, red, yellow and green. The advantages to be realised by the No.2 scheme as compared with No.1 are :- (1) The replacing of the non-positive electrical link between the main and relay switch by the positive mechanical link, thus rendering unnecessary the three point push button switch, and (2) The elimination of the heavy series winding on the relay switch. Having got the motor into position on the engine preliminary trials were made by applying a battery directly to the sliding armature motor, i.e. from the | ||