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).
List of improvements made to the battery ignition system.
| Identifier | ExFiles\Box 32\5\ Scan098 | |
| Date | 21th December 1931 | |
| COPY. BY.{R.W. Bailey - Chief Engineer} HS{Lord Ernest Hives - Chair}/WST. } FROM R.{Sir Henry Royce} & E.{Mr Elliott - Chief Engineer} 86096. R1/M21.12.31. X6095/6 C. to - SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} BATTERY IGNITION. We have done the following to improve ignition on our earlier system, and Delco: (1) Adopted Delco double contact maker but not their timing of one relative to the other, because it is more dangerous than beneficial. (2) It is better than Delco for HT. insulation, moisture, and water, and longer surface insulation, both HT. stator and rotor. (3) Retained our accurate governorp which is very important for proper advance with speed. (4) HT. terminals same as coil. (5) Better carried ht. rotor for closer and more even jump spark gap. (6) Contact LT. more safe and reliable. (7) Duplex earthing of casing. (8) Better ventialtion of distributor by disc rotor. (9) Delco spare contacts can be used. R.{Sir Henry Royce} | ||