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).
With a diagram and notes on a combined magneto and battery ignition automatic advance system.
| Identifier | ExFiles\Box 72\1\ scan0158 | |
| Date | 1st April 1924 | |
| x9040 S E C R E T RL/M3.4.24. To E.{Mr Elliott - Chief Engineer} from R.{Sir Henry Royce} c. CJ. RG.{Mr Rowledge} c. HS.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} Mr. Claremont. E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. COMBINED MAGNETO & BATTERY IGNITION AUTOMATIC ADVANCE. (R.R. HYDRAULIC RELAY). X.3949. X.9780. X.9040. I have done some work on this and from my drawing I find the following, which I describe in the following sketches:- [Text associated with diagram] Left side: A cross arm governor xxx perhaps distinctly larger than that for battery ignition, but otherwise the same. Sliding box that cannot turn. Lubricating oil pressure. 2 1/4" dia. cyl. 4" long, fitted with double trunk piston having hat leathers as shewn. Oil pressure admitted between piston trying to get through sleeve of trunk which is perforated in the centre but covered by valve (central collar). See next sketch. Right side: Connecting links to collar. Having a stroke of .9 to 1.1 Cross pin & slot. Driving worm. Inner sliding & revolving spindle. Very small dia. thrust (double). 3/4" dia. 5 collars. Central valve (hollow) having .1 movement up & down in piston. Exhaust drain to crankchamber. (1) | ||