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).
Technical analysis of condenser capacity changes due to temperature cycles.
| Identifier | WestWitteringFiles\K\October1923\ Scan101 | |
| Date | 29th October 1923 | |
| Contd. -7- EFC3/T29.10.23. is instanced by condenser No.32. On the cycles of temperature experienced on the chassis, the tendency will be for the average capacity of such a condenser at 18°C to be more nearly on the top limit of .325 mf. It might therefore result in more uniformity of condenser capacities if they were arranged to have the same capacity after having been maintained at one definite temperature only for a considerable time, though this perhaps would be rather difficult. The above conclusions may not be entirely correct as in some cases the return to the original capacity at steady atmospheric temperature of given amount does not seem to be complete. It rather appears that the conclusions only apply so long as the leakage point has not been exceeded, and that the effect of the leakage current is to permanently alter the dielectric in some manner. Our experience with sentinels has indicated that the condenser temperature on the chassis does not in the majority of cases ever exceed 70°C. If the condenser temperature reaches 65°C, the capacities in the majority of instances must be considerably up, but there is no definite evidence that the rise of capacity on the chassis has caused any irregularity in the working of the ignition, in an otherwise good condenser. It will be noted from the curves that the L points are lowerd down on the return curve than | ||