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).
The specifications for four sheets of automatic advance curves for various ignition systems.
| Identifier | ExFiles\Box 37\1\ scan 264 | |
| Date | 27th August 1924 | |
| X.3949. EFC3/T27.8.24. AUTOMATIC ADVANCE CURVES. We want to date to have four sheets of automatic advance curves, respectively labelled :- (A) (B1) (B2) (C) Group A.{Mr Adams} will be with reference to the battery ignition on 20 HP. chassis only, and contain (1) The nearest curve to (1) obtained by calculation. (2) The actual average representative curve of the automatic advance obtained on test. (3) Two dotted curves representing the limits given on the production test of this unit. This set of curves is already in existence but needs labellingand scales making uniform with those of other curves. Group B1. This is with referance to the earlier Scintilla magnetos and will contain (1) The actual average representative curve of the automatic advance (of the R.R. Battery Ignition Governor) obtained on test. (2) Advance curve of the two earlier AM-6-A type Scintilla magnetos (dotted). (3) Advance curve of the early AG-6 Scintilla magneto. (full). Group B2. is with reference to the later Scintilla magnetos, and contains:- (1) The actual average representative curve of the automatic advance (of the R.R. Battery Ignition Governor) obtained on test. (2) Advance curves of the two later AM-6-A magnetos (full.) (3) Advance curves of the later AG-6-A Scintilla magneto (dotted). Contd. | ||