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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).
Comparison of battery versus magneto ignition for ease of starting a small pump engine.

Identifier  ExFiles\Box 21\6\  Scan046
Date  15th November 1921
  
Contd. -2- R3/G15.11.21.

With regard to the efficiency of ignition while starting, the small pump engine here has its ignition plug in a position which gets coated with the ingoing petrol, and when cold this seems to insulate it sufficiently to prevent the magneto spark jumping across the points at slow speeds. Whenever the engine is changed over to battery ignition it starts immediately shewing that for ease of starting a battery ignition is much to be preferred to the magneto.

R.{Sir Henry Royce}

[Watermark: DICKINSON BOND 1804 MADE AT CROXLEY]
  
  


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