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).
Technical query regarding the ignition battery and magneto contact breaker block, including a sketch and discussion of angles.
| Identifier | ExFiles\Box 57\2\ Scan164 | |
| Date | 12th February 1927 | |
| X5790 To E.{Mr Elliott - Chief Engineer} EFC. ( FROM R.{Sir Henry Royce} EY. Hs.{Lord Ernest Hives - Chair} At Le CanadelHenry Royce's French residence ). RI/M9.2.27. DESPATCHED FROM WW. c. to Wor.{Arthur Wormald - General Works Manager} BJ. 12.2.27. IGNITION - BATTERY & MAGNETO CONTACT BREAKER. BLOCK. I am not quite sure E's off-set angle of 25/30° is measured correctly; I take it E, means - [Diagram with labels A, B, C] 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. X.5790. On the 20 HP. does the magneto spark burn the distributor points ? Ought we to have inductor type which I understand is OK. with jump spark distributor ? X.7791. I understand we are asking for a sleeveless magneto for the 20 HP. as well as the 40/50. We are urgently awaiting Watford's samples of these, and the clock. X5792 Will EY. ask them when we can hope to have them ? R.{Sir Henry Royce} [Reversed text bleed-through at bottom of page] ROLLS-ROYCE ENGINE AND SPARES CERTIFICATE OF INSPECTION BY 'A'ID CERTIFICATE NO | ||