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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 adjusting primary point gap and measuring armature core flux.

Identifier  ExFiles\Box 4\5\  05-page141
Date  1st February 1921 guessed
  
-5- Contd.

(21) Now ascertain if gap has been altered appreciably.
(22) Now vary primary point gap ± .004" above and below original setting and again observe timing.
(23) The armature core flux at different speeds shall now be obtained, making use of a thermionic rectifying valve, high resistance and low reading moving coil ammeter, in a manner elsewhere explained.


(17) and (23) omitted at first.


RFC.
  
  


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