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).
Spark gap testing, noting issues with regular sparking and its relation to condenser capacities.
| Identifier | ExFiles\Box 54\3\ Scan223 | |
| Date | 23th November 1921 | |
| -2- Contd. 2.0 mm and sometimes the sparks appear much more purple. The difficulty in obtaining regular sparking may be due to slight roughness of the surface of the electrodes. Perfect smoothness could not well be maintained owing to the burning of the sparks. In the test of spark-lengths obtainable for various primary capacities, a set of readings was also taken on the annular gap (report AB.31 23.11.21). Of these, neither the possible nor regular spark lengths, seemed to show any particular relation to the condenser capacities. The gap does not therefore at present seem suitable for general use. F.J.A. | ||