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).
The specifications and modifications of the Final S.S. Standard switchbox.
| Identifier | ExFiles\Box 65\2\ scan0022 | |
| Date | 28th February 1929 guessed | |
| -2- Contd. Final S.S. Standard. This has switch positions "off", M & B., M B & C, M & C. It is a still further modification of the Phantom experimental switchbox which has magneto at every position of the switch, but so arranged that the auxiliary switch, as in the S.S. case, cuts out magneto in the two positions M & B and M B & C only. It has the S.S. casing and tail, but being a modification of the standard box does not have the dynamo armature contact extended to the M & B position but only extended beyond the field contact, so that there is some amount of delay of the armature break relative to the field break. EFC. | ||