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).
On the experimental testing and analysis of a U.S.A. Bosch battery ignition system's coil and condenser.
| Identifier | WestWitteringFiles\G\September1921\ Scan35 | |
| Date | 15th September 1931 | |
| ORIGINAL To R.{Sir Henry Royce} & M.{Mr Moon / Mr Moore} from EFC. c. to CJ. & FN. c. to Hy.{Tom Haldenby - Plant Engineer} & EF. c. to Re. & Da.{Bernard Day - Chassis Design} c. to R.R. of America Inc. EFC2/15.9.31. X.4275 - U.S.A. BOSCH BATTERY IGNITION. X3485 We have had very little opportunity so far for conducting any experimental work on the bench with the U.S.A. Bosch battery ignition. Of the two sets which have been received (one of which was brought over by Mr. Hives and the second one of which came over on 4-EX) one distributor is at West WitteringHenry Royce's home town and the other has been in constant use on experimental cars. We are, however, expecting shortly to receive three more of these sets, when all the quantities of this ignition will be investigated. We have, however, made a few measurements on the coil and the condenser. We found the resistance of the coil to be approximately similar to our standard (slightly less). The inductance is rather less than half that of our standard. As regards the condenser, a test of this showed the capacity to be .3 mf, - our present standard is .215 (average). We found the Bosch condenser to have practically no leakage conductance when cold, but after working on 200 volts, 50~ a.c for some time, the condenser heats up due to di-electric losses, allowing quite a large current - about 1/3 of an ampere - to flow. With regard to Mr. Royce remark about the Contd. | ||