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).
Experiments comparing the effect of High Tension (H.T.) cable length on spark gap for an R.R. standard coil and a Remy coil.
| Identifier | ExFiles\Box 52\3\ Scan347 | |
| Date | 14th November 1919 | |
| Contd. -5- EFC {E. Fowler Clarke - Electrical Engineer} 1/T14.11.19. 3. Effect of length of H.T. cable on length of spark gap in air. We have experimented on the above lines with an R.R. standard coil using similar high tension cable to that outlined above and a special adjustable platinum point spark gap. (The running current was reduced from normal (.92) to .87 in this test by the insertion of resistance). The length of cable connecting the coil to the gap was varied and the gap was adjusted to that length which just permitted regular sparking, the other conditions being the same throughout. Similar experiments were carried out on a Remy coil (with normal current consumption). The attached curves give the results obtained in both cases. The results for the Remy coil appear more consistent than those obtained with the R.R. coil. In each case, however, there appear to be singularities in these curves at which the falling off with the spark length for increase in the length of the cable is arrested as if due to some sort of resonant action in the cable. It will also be noticed that the spark length on the R.R. coil falls off more rapidly with the length of cable than in the case of the Remy coil. In the case of both R.R. and Remy coils, the same R.R. condenser was used. Falling off in spark length due to the addition of H.T. capacity in this manner, would appear to be similar to the falling off/to the addition of high tension capacity across the primary points. We do not Contd. 1000 12/19 (4149) '91E 5481/L 001 y 202 R.R. | ||