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).
Improvements to battery ignition systems, specifically tungsten contacts, distributor materials, and porcelain ignition plugs.
| Identifier | WestWitteringFiles\R\October1927-December1927\ Scan107 | |
| Date | 28th November 1927 | |
| HS{Lord Ernest Hives - Chair} EFC. } FROM R.{Sir Henry Royce} BY.{R.W. Bailey - Chief Engineer} } C. to BJ. WOR{Arthur Wormald - General Works Manager} ORIGINAL BATTERY IGNITION & PLUGS. R3/M28.11.27. 3 X 8692 X 4841 X8690 Scrubbing tungsten contacts to LeC. 2460. are we believe now standard, with the improved spring (non fracture-easily detachable). We have no record of the thickness of spring and stress at requisite contact pressure = 1 1/2 lbs. Further experiments are going forward to prove if there are any advantages in - (1) Increased scrub. (2) Offset rocker fibre giving slightly quicker break than make. (3) Distributor improvements - umbrella and non-tracking material (stabalite.) We are particularly anxious about (3) because (1) and (2) can only give us small improvement. What is stopping English makers from making porcelain ignition plugs equal to Champion, as we understand these are superior to anything on aero engines - i.e. most trying conditions. R.{Sir Henry Royce} [STAMP] RECEIVED NOV 29 1927 | ||