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).
Proposed wiring modifications for the distribution and switchbox connections, continued on page 2.
| Identifier | ExFiles\Box 163\6\ img013 | |
| Date | 30th January 1930 guessed | |
| -2- the distribution box. Figure 1. shews the present straight through connection of switchbox terminal 2. to distribution box terminal 2. Figure 2. shews the insertion of a charge reducing field resistance, the switchbox terminal now becoming 2R. Figure 3. shews the addition of a terminal 2 on the switchbox and corresponding wire. Figure 3. also shews the further addition of the extra terminal 2R. on the distribution box with its corresponding wire. Figure 4. shews the same result differently drawn indicating more directly, the duplication of the two wire between switchbox and distribution box, and the fact that the field resistance can be placed near either box according to convenience. We have given some thought to this matter, and do not see any more reasonable way of carrying out the whole modification. Even if we go over completely to mere mechanical inter-connection, we have still got the difficulty of connecting the resistance electrically in the field wire between the distribution box and the dynamo, this demanding two extra wires between distribution and switchbox. The possibility referred to in your 4th paragraph of relying upon the cut-out only to break the circuit, is agreed to be objectionable if it invariably occurred in the ordinary course of events, but could not, in our opinion, be considered an appreciable drawback in the case proposed, in view of the probable rarity of that occurrence. Nevertheless we think that the first proposal, provided this is not considered too complicated, will satisfactorily meet the case. In comparing the two proposals, there should be taken into account, consideration of the fact that the inclusion of a resistance would have to be on similar lines to that described for the pure mechanical inter-connection referred to above. As a point of minor importance, your blue print is not quite in accordance with the usually accepted | ||