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 testing of Scintilla Magneto types AC-6-A and AG-6-A, focusing on their automatic advance feature.
| Identifier | WestWitteringFiles\L\2April1924-June1924\ Scan40 | |
| Date | 9th May 1924 | |
| To R.{Sir Henry Royce} from EFC. c. C.J. & FN. c. EY. EP.{G. Eric Platford - Chief Quality Engineer} DA.{Bernard Day - Chassis Design} c. E.{Mr Elliott - Chief Engineer} ORIGINAL COPY. EPC1/T9.5.24. X.4187 - SCINTILLA MAGNETOS TYPES AC-6-A AND AG-6-A (BOTH TYPES INCORPORATING AUTOMATIC ADVANCE). In all, three machines have been variously tested and this report is principally on the bench tests carried out thereupon. Some of the features of mechanical and electrical design (the machines being similar) are contained in my assistant's report PB.95 herewith, on one of these magnetos. An earlier machine of this type was taken and shown to Mr. Royce by Hs.{Lord Ernest Hives - Chair} in 1920. At the time it was considered by R.{Sir Henry Royce} that though the workmanship was excellent, the design involved too much novelty to be of any use to us, and the machine was returned untested, after inspection. The possibilities of Scintilla magnetos were later reconsidered (see Hs{Lord Ernest Hives - Chair}2/LCS.12.22) because these incorporated an automatic advance which was desired on a magneto to bring this into line with the battery ignition. Of the three machines herein reported, the first, type AG-6-A No.21523 was received by us on 11.1.23. This was bench tested for automatic advance with the result contained on attached sheets, (section dated 19.1.23) and on sheet of comparative curves, photostat copy of which is also attached. The machine was then fitted to chassis 7-GII and has been very favourably referred to by Hs.{Lord Ernest Hives - Chair} in his Hs{Lord Ernest Hives - Chair}2/LCS.2.23, not only on the score of general performance but also as regards automatic advance | ||