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).
Page discussing the distributor make ratio and ignition firing sequence, including a hand-drawn diagram.
| Identifier | ExFiles\Box 181\M11\ img137 | |
| Date | 6th July 1919 guessed | |
| To EFC. from R.{Sir Henry Royce} -3- R4/G1219 Contd. My scheme is that the make ratio is made as large as convenient, and assuming that the distributor moves exactly with the low tension timer, and that the distributor is always fitted in relation to the timer as late as possible, and has a one to one duration, then in moving backwards the apparatus can only fire a cylinder that is past. [Hand-drawn diagram of a distributor] Diagram labels: no1 x4 x2 6 duration 30° 3x 2 5x Diagram annotation: Position of distributor rotor when firing No.1 normally. Then moving backward ignition has no chance of firing 1 but will fire 4. This will be safer the longer the make period, not the shorter as stated in your memo. R.{Sir Henry Royce} [signature] : [Faint text at bottom edge: WW. H & S Ld. (B'm) (K1X MOC 50-9/1) PSS. 2125/11] | ||