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 list of numbered technical points and suggestions regarding electrical components and wiring.
| Identifier | WestWitteringFiles\C\August1919\ Scan18 | |
| Date | 1st August 1919 | |
| To EFC. from E.{Mr Elliott - Chief Engineer} -2- E8/G21/8/19 Contd. (4) The rear end of the brush for the main contact should be bevelled off at the same angle as the standard, so as to clear the inside of the switch case. By (5) Mr. Royce considers that the spring on the carbon brush is rather on the weak side, and wishes you to try a spring giving about double the pressure of that on 1 EX. Actually 1 EX. spring has been increased in pressure by using a longer pin through the spring spindle, which has forced up the washer until it is resting on the pin by its outer flange. This seems to work quite well, but the pressure might yet be a little more, as indicated above. By (6) It is thought that the main springs on the switch are unnecessarily strong, and it is desired that you should try thin laminated copper strips in place of the present bronze springs which carry the current and act in parallel mechanically with the steel springs. These strips will conform more readily than the present device, to the shape of the steel spring, and will thus facilitate the operations of assembling the switch. ? (7) It is desired that further particulars be sent of the construction of the relay coil. It is noted that there are sheet metal tab connections for the wiring. Would you please send Mr. Royce further information as to how these are connected up inside. It is conventional, as you probably know, to use a length of flexible on each end of the coil for connection purpose. It is not known whether this is incorporated or not. By (8) It is thought that the best way of insulating the inside surface of the switch cover is to use stove enamel. This should be cheaper than the shellac varnish and micanite on 1 EX. If the enamelling is correctly done, it will provide a tough coating which will not chip off. 7 CA. switch cover was treated with enamel but the finish was rather rough, and could be improved upon. Answered (9) The cables from the switch of the starting motor are much too near the exhaust pipe. This also applies to the conductors passing to the left hand head light, and side light. Mr. Royce points out that there is a much better and shorter path for these conductors through the dash, passing over the engine foot. Also, that there is unnecessary metal on the inside profile of the dash which should be cut off, as shewn in the diagram. X3469 O.K [Diagram showing a profile of the dash to be cut] THIS MIGHT BE APPLIED TO BOTH SIDES OF THE DASH IN THE FUTURE A straight line can be taken from the top of the present opening to the bottom where the dashboard bracket joins on. (Contd.) R'R' S327 (200 L) (R'D' 402 Sp{Mr Spinney}-11) BW' S'PAPER' | ||