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).
Ignition system tests involving coils, condensers, and high-tension wiring.
| Identifier | ExFiles\Box 52\3\ Scan304 | |
| Date | 11th December 1917 guessed | |
| -15- Contd. EFC {E. Fowler Clarke - Electrical Engineer} 2/T11.1.21.7 Thus considering the Remy 6 coil (without own condenser cut out), the placing of the 12 cylinder condenser right across the points, reduced the arc to nothing, (only a slight "splash" remains) and establishes the secondary sparking. Upon interposing a length of about 15 feet of H.T. cable, a considerable portion of the arc made its appearance and missing took place on the secondary. By doubling the capacity in this position the arc was again reduced and secondary missing prevented. The additionof still more capacity seemed only to reduce the arc to a limiting value and did not again put out the secondary spark. It would seem that no amount of capacity at this distance would equal in value, either as regards primary or secondary sparks effects, the appropriate capacity across the points. We then connected a very long coil of H.T. wire between condenser and contact points and the result was exactly as if no condenser had been there whatever capacity was tried. - Contd. | ||