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 magneto distributor dimensions and H.T. safety gaps, including a sketch and data table.
| Identifier | ExFiles\Box 48\2\ Scan088 | |
| Date | 9th May 1924 | |
| Contd. -5- EFC {E. Fowler Clarke - Electrical Engineer} 1/T9.5.24. 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:- AM6-A. {Mr Adams} 26485. 11.5 mm. " 34937. 11.8 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 labels: A, B, C, D or E Magneto. Conductor pitch. Conductor Width. Brush Width. Overlap at break fully advanced. Overlap at break fully retarded. A. {Mr Adams} B. C. D. {John DeLooze - Company Secretary} 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 .805 .19 .24 .47 Contd. | ||