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).
Standardisation and cost of the ballast resistance design for an ignition coil.
| Identifier | WestWitteringFiles\C\May1919\ Scan21 | |
| Date | 24th May 1919 | |
| To DA.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} -2- E1/G24/5/19 Contd. be pinned to the bolt passing through the centre of the coil, and the collar itself made hexagonal. The electrical connection to this central bolt from the low tension wiring of the coil should be made to the existing terminal plate by a sheet metal connection, as shewn. It is not desired to remove the terminal plate and make the connection direct. Mr. Royce considers that this method of carrying the ballast resistance is more expensive than carrying the ballast on the distribution board, and that it might be found desirable to revert to the latter in the future. Would you kindly proceed to put in hand the necessary work for effecting the immediate standardisation of the design given by LeC.1094. Referring to Mr. Clark's memo EFC6/T22/5/19, it should be noted that with the ballast resistance carried on the bottom of the coil box only one terminal connection is required on the distribution board for the ignition. E.{Mr Elliott - Chief Engineer} | ||