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).
Continuation of a report on electrical tests of components and materials like Elo, bakelite, and stabalite for leakage and spark performance.
| Identifier | WestWitteringFiles\J\November1922\ Scan80 | |
| Date | 15th November 1922 guessed | |
| -2- Contd. Weston milli-ammeter to a 200 volt d.c. supply. When cold, no leakage could be detected, but when hot, both cases showed a leakage resistance of about .5 A similar test was made on a stabalite case which showed no leakage either hot or cold. It was found however that with any condenser across a spark-gap, the introduction of another gap in series with the condenser (losses) was able to cause misfiring or even spark extinction at the main gap. But this could not be imitated with the Elo disc dielectric condenser by introducing an air space between it and the earthed plate and so causing ionization; possibly because the actual capacity diminished too rapidly. A test in which a coil was placed successively in Elo, bakelite and stabalite cases, without linings, but with an earthed tin-foil wrapping, showed that the spark length was diminished rather more with the elo case than the bakelite especially when hot, and only slightly with the stabalite case either hot or cold. F.J.A. | ||