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).
Use and modification of tungsten contacts on a low tension make and break ignition system.
| Identifier | WestWitteringFiles\F\May1921\ Scan9 | |
| Date | 7th May 1921 | |
| To EFC. from E.{Mr Elliott - Chief Engineer} Copy to CJ. " " HS.{Lord Ernest Hives - Chair} " " DA.{Bernard Day - Chassis Design} " " BY.{R.W. Bailey - Chief Engineer} ORIGINAL E1/G7/5/21. X.1819 X. 2894 RE TUNGSTEN CONTACTS ON LOW TENSION MAKE AND BREAK. Referring to the use of tungsten on the low tension contact maker, Mr. Royce would like you to try whether this will be more successful on the R.R. ignition if some scrub is definitely introduced into the contacts. As designed, the R.R. blade type of low tension make and break is arranged to avoid scrub, but could be altered for the purpose of this experiment, by either lifting the contact blade half way along its length, so that it bends and drags one contact across the other at the moment of being lifted or being dropped; or by putting the clamping face of the blade out of line with the contact surfaces in such a manner that the moving contact approaches the stationary contact from an angular instead of a normal direction. E.{Mr Elliott - Chief Engineer} [Stamp: RECEIVED MAY 7 1921 Hs{Lord Ernest Hives - Chair}] R.R 'E' DEPT. 100 J (2) H.{Arthur M. Hanbury - Head Complaints} 128' 11-8-20 C 3800 | ||