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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).
Ability test of a spark-coil, comparing its performance against a Watford E6 magneto under various conditions.

Identifier  ExFiles\Box 4\5\  05-page120
Date  10th December 1920
  
ROLLS-ROYCE LIMITED.
INSTRUCTIONS.
88259
19
To
Order No
Customer's No. 2 (contd)
Re: Ability Test of Spark-coil
the Watford E6 magneto reported
10-XII-20
The ignition coil appears to do better than the magneto where the gap is shunted mainly by an inductance, but not so well where resistance predominates.
Conditions | Gaps | Remarks
Gap plain (no shunt) | 8.5
2 coils (series) prim. open | 7.25
" " " prim. closed | 6.0
" " " both prim. " | 2.0 | Fair sparking
1 coil prim. open | 6.0 | (at 4.5 revs)
" " " closed | 1.5
Signed: Francis J Allen
This Sheet must be filed on completion of the work.
  
  


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