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).
Comparison of dimensions for Scintilla and Watford magnetos with a supporting sketch and table of data.
| Identifier | WestWitteringFiles\L\2April1924-June1924\ Scan44 | |
| Date | 9th May 1934 | |
| Contd. -o- EFCL/T9.5.34. For other features of the design, see report FB.95. (3) The magnetic air gaps are unobtainable. (4) The length of H.T. safety gaps:- AMS-A.{Mr Adams} 26485. 11.5 mm. " 34937. 11.5 mm. Watford E06. 8.5 mm. Though of course the distributor is considerably different in arrangement, we found the dimensions to be the equivalent of the following sketch and table, to which also those of the standard Watford E06, are added for comparison:- (Sketch with labels A, B, C, D, E) Magneto. Conductor Pitch. A.{Mr Adams} Conductor Width. B. Brush Width. C. Overlap at Break Fully Advanced. D.{John DeLooze - Company Secretary} Overlap at Break Fully Retarded. E.{Mr Elliott - Chief Engineer} Scintilla No.26485. .960 .195 .460 .17 .46 Scintilla No.34937. .940 .195 .460 .10 .39 Watford E06. 1.257 .305 .19 .24 .47 (INCHES) Contd. | ||