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).
Technical memorandum discussing modifications to a switchbox for ignition systems.
| Identifier | WestWitteringFiles\L\Jan1924-March1924\ Scan137 | |
| Date | 25th March 1924 | |
| TO E.{Mr Elliott - Chief Engineer} FROM R.{Sir Henry Royce} ORIGINAL R3/M25. 3. 24. Copy to - CJ. " RG.{Mr Rowledge} BR.{T. E. Bellringer - Repair Manager} " HCF KFC. " BY.{R.W. Bailey - Chief Engineer} FH. E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. SWITCHBOX MODIFICATIONS. X9730 It is not advisable to pass the battery ignition current through two switches in series, because it reduces the reliability. Supposing we had the modification for 4 positions and an extra switch combined somewhere just to stop the magneto only quite separately, so that no ignition could be obtained without the switch (lock), and when running in 'BM.& C' we could switch off magneto, just a simple one contact earthing device in parallel with the earthing device already used. R.{Sir Henry Royce} | ||