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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).
Report page detailing the accuracy of engine timing methods and devices.

Identifier  ExFiles\Box 33\4\  Scan104
Date  12th December 1927 guessed
  
contd :- -2-

Thus with 1/4" oil tube, multiplication =

5²/.25² = 400/1

Checking by the oil tube method has shewn that
the timing device is only accurate to within 3° or 4° on either
side of T. D.{John DeLooze - Company Secretary} C. when used by our own testers.
Timing the magnetos by the pointer on the timing
device is slightly more accurate - the piston movement being
more rapid at 35° before T. D.{John DeLooze - Company Secretary} C. The timing device is accurate
to within 3° of M.{Mr Moon / Mr Moore} A.{Mr Adams} when checked on the degree plate.
Suggestions regarding the timing of F.XI and XII
engines will follow in a later report.



Hs{Lord Ernest Hives - Chair}/V.Halliwell.
  
  


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