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).
Translated research paper on the working of sparking plugs by R. Anthouard.
| Identifier | ExFiles\Box 58\2\ Scan157 | |
| Date | 11th October 1934 guessed | |
| Translation from the French: RESEARCHES ON THE WORKING OF SPARKING PLUGS, by R.{Sir Henry Royce} Anthouard We have studied the intensity "i" and the voltage "V" of the current supplied bya one-plug magneto. Both "i" and "V" were studied by means of a 'Dufour' cathodic oscillograph, disposed for observing the two variables in succession. Results. A first series of observations took place in air compressed at a maximum of 5 kg/cm2 (71 lb/sq.in.) The type-spark produced three successive phases: 1) An effluvium phase.- For about 10^-4 second, the tension at the terminals passes from "O" to several thousand volts; current intensity oscillates in an ill-defined manner around a few milliamps. 2) A disruptive phase.- Within a maximum period of time of 10^-6 second (and probably less) the tension falls to "O" while intensity increases up to nearly 100 milliamps. 3) An arc phase.- Oscillating at first, the oscillations soon decrease (in fewer than 10 oscillations), then stop suddenly, when the intensity still amounts to 10-20 milliamps. It may be that the tension remains almost constant and in the neighborhood of 1000 volts. Examples. Intensity.- Figure 1 shows an intensity in conformity with that description. Sparks are however very often complicated by fresh disruptive discharges, taking place during | ||