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).
Specification sheet comparing distributor dimensions with suggested dimensions for the Lucas Magneto Type ER6 No. 50.
| Identifier | ExFiles\Box 40\2\ Scan090 | |
| Date | 1st April 1936 guessed | |
| X.8793. LUCAS MAGNETO TYPE ER6. No.50. Distributor dimensions. Suggested dimensions. Pitch = 1.28" 1.25" Range = .41" .425" Make ratio = .775 .70" Brush = .197 .250" Segment = .795 .675" Forward overlap at advance = .21 .125" Forward overlap at retard = .62 .55" Backward overlap at advance = .28 .25" Backward overlap at retard = -.14 -.175" Distributor dia. = 2.44 2.400" Absolute insulation distance = .495 .45 EFC. | ||