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 table of Watford EO6 magneto distributor dimensions against suggested dimensions.
| Identifier | ExFiles\Box 48\2\ Scan420 | |
| Date | 31th March 1926 | |
| X8796 31.3.26 COMPARISON BETWEEN WATFORD EO6 MAGNETO DISTRIBUTOR DIMENSIONS AND SUGGESTED DIMENSIONS. | Unit. | Watford dimensions. | Suggested dimensions. | |-----------------------------------|---------------------|-----------------------| | Pitch. | 1.25" | 1.25" | | Make ratio. | 1.07" | .70" | | Range. | .434" | .425" | | Forward overlap at full advance | .064" | .125" | | Forward overlap at full retard. | .413" | .55" | | Backward overlap at full advance. | .500" | .25" | | Backward overlap at full retard. | .135" | -.175" | | Absolute insulation distance. | .44" | .45" | | Distributor dia. | 2.400" | 2.400" | EFC {E. Fowler Clarke - Electrical Engineer} /HEW. | ||