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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).
Off-set angle of an ignition contact breaker, with a sketch and related queries.

Identifier  ExFiles\Box 61b\1\  scan0016
Date  12th February 1927
  
TO E.{Mr Elliott - Chief Engineer} P.C.) FROM R.{Sir Henry Royce}
BY.{R.W. Bailey - Chief Engineer} HS.{Lord Ernest Hives - Chair}) (At Le CanadelHenry Royce's French residence.)
Copy to - WOR.{Arthur Wormald - General Works Manager} BJ.
X4041
R1/M9.2.27.
DESPATCHED FROM WW.
12.2.27.
IGNITION - BATTERY & MAGNETO
CONTACT BREAKER. - CLOCK.
X5790
X4041
X
I am not quite sure E's off-set angle of 25/30° is measured correctly: I take it E.{Mr Elliott - Chief Engineer} means -
B. & C. pass through the centre of the cam 25° to 30° apart, A.{Mr Adams} is at right angles to B. All taken at half lift (point of break.)
E.{Mr Elliott - Chief Engineer} does not give line A.{Mr Adams}
Sketches are not intended to be taken for drawing, because if so, 25/30° seems altogether too much.
On the 20HP. does the magneto spark burn the distributor points? Ought we to have inductor type which I understand is OK. with jump spark distributor?
I understand we are asking for a sleeveless magneto for the 20HP. as well as the 40/50. We are urgent-ly awaiting Watford's samples of these, and the clock. Will BY.{R.W. Bailey - Chief Engineer} ask them when we can hope to have them?
R.{Sir Henry Royce}
  
  


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