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).
The testing and performance issues of electrical coils, tremblers, and condensers.
| Identifier | ExFiles\Box 180\M3\M3.3\ img026 | |
| Date | 24th February 1920 | |
| Contd. -3- CK{Mr Clark}2/T24.2.20. are unstable. On screwing down a little further to obtain regular vibration, the current immediately goes down to nearly its minimum value which value is reached on screwing down still a little further. The current then remains approximately constant during a frequency range of from about 7,000 per minute to 5,000 per minute, after which the current goes up again. Thus, with the coil in its approx- imately correct setting, there are about 6,500 discharges per minute. No. 6163. This coil did not behave well. The special trembler was not quite correctly fitted which caused the armature to move out of place. Further there was something wrong with the condenser connection which caused undue flashing at the points. It was curious, however, that a measurement of the condenser capacity on an A.C. main showed this to be just the same as for the previous coil. also connecting the condenser of the previous coil across the condenser terminals of the present coil, reduced the sparking at the points. to normal. The symptoms were therefore those of a considerable resistance in the condenser circuit. We are having these points put right on this particular coil. The 12 volt coil No. O behaved well although the discharges were not as brilliant and the spark length not as long as the 6 volt coil. The minimum current taken was .36 amp. and at this current, the number of breaks per minute Contd. | ||