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).
Performance of tungsten contact points in battery ignition systems and the required condenser capacity.
| Identifier | ExFiles\Box 165\5\ img029 | |
| Date | 4th October 1930 | |
| X6112 To R.{Sir Henry Royce} from EFC. c. Sg.{Arthur F. Sidgreaves - MD} c. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} c. Da.{Bernard Day - Chassis Design} Ry. EFC3/ADL 4.10.30. X.2894. PERFORMANCE OF TUNGSTEN CONTACT POINTS X.6037. Arising out of one or two minor complaints which have been received on the performance of battery ignition tungsten contact points some further bench experiments and observations on experimental chassis have been made. As a result of these we have arrived fairly definitely at the conclusion that the working of these tungsten points on our battery ignition is considerably affected by the capacity of the condenser, but not in the direction previously indicated by experiments on platinum points and perhaps rather assumed to hold in the case of tungsten points. To be exact, our conclusion from our definite experimental evidence is that the right condenser capacity for these tungsten points is somewhat lower (about 33% lower than the present standard capacity, bringing us back to the old condensercapacity which we used to use before the standardisation of the 50% increased capacity condenser by standardisation sheet dated 31.1.24. We do not imply that the benefit of such reduced condenser capacity is greater than, or takes the place | ||