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).
Continued analysis of switchbox wiring arrangements concerning a green lamp, dynamo, and battery contacts.
| Identifier | ExFiles\Box 60\3\ Scan092 | |
| Date | 19th December 1928 guessed | |
| -2- Contd. broke connection with the battery after or before C. N.B. If it broke before C, the green lamp coil current would pass through the dynamo field in the right direction. From the point of view of the switchbox, our evidence at present stands that we wish to C to break before B. With the B contact extended to the M & B position of the switch, however, we do not satisfy the condition of turning off the green lamp when we switch to M & B, and we cannot have the C contact so extended for other reasons. We have now carefully considered every possible case and there does not appear to be any way of meeting all points perfectly satisfactorily, unless an entirely independent contact for the green lamp circuit in the M, B & C, and M & C positions is provided. This, however, requires an additional wire in the conduit and an additional terminal on the distribution box. Short of doing that, the least objectionable arrangement appears to be to revert to the previous state of the switchbox when in which both B and C are broken when charge is switched off, and to give/the green lamp switch coil positive to B. The delay in breaking B in relation to C would be made as great as possible in that position of the switch. The only undesirable feature of this arrangement (as stated, this appears to be the least undesirable feature arising out of any of the possible arrangements) is the fact that if the main dynamo armature fuse is removed or melted and the charging switch is on, the field of the dynamo is excited from the battery and the | ||