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).
Experimental findings on the performance of tungsten contact points and related condenser capacity.
| Identifier | WestWitteringFiles\U\August1930-November1930\ Scan124 | |
| Date | 14th October 1930 | |
| 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} Ev.{Ivan Evernden - coachwork} ORIGINAL EFC3/AD14.10.30. X.2894. PERFORMANCE OF TUNGSTEN CONTACT POINTS. 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 on 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 condenser capacity 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 | ||