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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).
Instructions for testing the sparking characteristics and performance of a magneto.

Identifier  ExFiles\Box 4\5\  05-page138
Date  3rd February 1921 guessed
  
-4- Contd.

contact breaker lever advanced until the maximum sparking
advance is found.
NOTE:- The maximum sparking advance can be taken
to be that advance at which 100 sparks, without missing,
are given by the magneto at some time within a period not
greater than 5 minutes.
A mark shall be made to indicate this advance
after the machine has been stopped. The contact breaker
lever shall now be retarded 34° making use of the disc
fitted to the spindle, used in (6).
(15) The magneto shall again be run at high speed and
the high speed sparking characteristics shall be obtained.
Remarks should be made as to at what speeds and under what
circumstances the magneto fails to spark, and in particular
the effect of flux distortion shall be noted from the
unequal character of the sparks from the two sides of the
magneto, if such a difference obtains.
(16) The low speed sparking characteristics of the
magneto shall now be obtained, with distributor connected
up as before to 5.5 mm. gaps. The slowest speeds at which
regular sparking shall occur with -
(a) Fully advanced position.
(b) Central position.
and (c) Fully retarded position.
(such positions corresponding to the range
obtained above)
shall be ascertained.
Contd.
  
  


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