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).
Instruction on issues with Watford EWB magnetos during endurance tests, recommending a switch to jump spark distributors.
| Identifier | ExFiles\Box 65\3\ scan0409 | |
| Date | 12th December 1929 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12-24) MP 306975 X7791 ROLLS-ROYCE LTD. INSTRUCTIONS. 12-12-1929 To: E.T.C. Order No. WD{Mr Wood/Mr Whitehead} 100 Customer's No. X7791/2 Watford EWB magnetos. In the course of endurance tests carried out on these magnetos on the bench it has been found necessary, to avoid misfiring, to clean out the distributor after a few thousand miles the carbon dust accumulation being considerable. Most magneto manufacturers now fix jump spark distributors to avoid this and we suggest approaching Messrs North's and asking them to submit an experimental magneto fitted with a jump spark distributor. Bosch, Lucas, M-L, Scintilla, B.T.H etc all fix jump spark distributors as a standard. Signed: H.E.W. This Sheet must be filed on completion of the work. | ||