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).
Analysis of spark ignition phenomena, including tension, pressure effects, and wire armouring.
Identifier | ExFiles\Box 58\2\ Scan158 | |
Date | 11th October 1934 guessed | |
2 the arc phase, and sometimes by oscillations at a frequency rate of 10^-6 (fig.2). Tension.- This shows great differences, according as to whether the distribution of the magneto is of the carbon (fig.4) or sparks (fig.5) type. Figure 3 is an example of numerous disruptive discharges in a spark. Figure 6 is a similar example, studied more in detail. Figures 3 and 5 are obtained with different plugs mounted on the same magneto. Remark.- Observations made with a tube fed from a transformer containing air under pressures varying from 1/20 to 1/10 of atm, have resulted in finding again the disruptive and the arc phases (as a rule, without oscillations). The effluvium phase has disappeared, but the electrodes - of plane, parallel and circular surfaces - became polished and their edges well rounded. (fig.7: tension; fig.8: intensity). Such are likely to be the main phenomena of an ignition spark produced by a magneto. Rise of pressure.- If the magneto gives a sufficient tension, the sparks passes; but it does not last so long, and the disruptive discharges are less numerous. Wire armouring.- The effect of armoured wire is comparable with that of an added capacity; the spark is produced if the magneto can charge the capacity at a disruptive tension. The total duration of the spark decreases, the disruptive | ||