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).
Blueprint showing the setting of an electrode on a 12-cylinder magneto.
| Identifier | ExFiles\Box 43\4\ Scan241 | |
| Date | 7th February 1930 | |
| X4021. SETTING OF ELECTRODE ON 12CYL MAGNETO 30° A.T.D.R. 857-1 Issue No POSITION OF ELECTRODE RELATIVE TO SEGMENT AT FULL RETARD (30°) POSITION OF ELECTRODE RELATIVE TO SEGMENT AT FULL ADVANCE 8° 7 1/2° TOTAL OF ANGLES OF ELECTRODE & SEGMENT - 15 1/2° ANGLE OF MOVEMENT OF ELECTRODE FROM A.T.D.R. 10° i.e. 30° ON ROTOR SPINDLE OVERLAP 5 1/2° Alterations Init. Date For Model No off North & Sons, Ltd WATFORD. Material Date Signature 7/2/30 | ||