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 relative distributor dimensions for the Lucas Magneto Type ERS.
| Identifier | ExFiles\Box 40\2\ Scan153 | |
| Date | 28th October 1926 | |
| H.E.W. 28.10.26. 8793 LUCAS MAGNETO TYPE ERS. Suggested relative dimensions. Relative distributor dimensions. No.50. No.54b. Pitch. 1.00 1.00 1.00 Make ratio. .56 .605 .56 Range. .34 .32 .33 Forward overlap at full advance. .10 .165 .13 Ditto at full retard. .44 .485 .41 Backward overlap at full advance. .20 .22 .20 Ditto at full retard. -.14 -.10 -.13 Brush + segment. .74 .78 .75 B + S + M 1.30 1.385 1.33 Insulation dist. I. .36 .385 .38 EFC. | ||