1. Reduction of Delay between Particle Passage and Spark Chamber Spark
2. Spark‐Gap Trigger System
3. Spark Chamber Pulsing System
4. 2)|The barium titanate slabs for the capacitors were obtained by special order from the Aerovox Corporation, Hi-Q Division, Olean, New York.
5. 3)|A sintered mixture of approximately equal amounts of copper and tungsten made by P. R. Mallory and Co.