spark gap

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A sparkgap is formed between one wall of the test section and the point of a steel needle, introduced through the opposite wall.
The other end of the anode holder is connected to the positive plate of the capacitor bank through an atmospheric air sparkgap.
For this purpose, the needle electrode of the sparkgap is replaced by a piece of hypodermic tubing of 0.033 in. internal diameter.
The closing process of a sparkgap could be divided into two phases, gas breakdown and voltage collapse.
When the front of this gas jet arrives at the synchronizing sparkgap the latter undergoes breakdown, providing a trigger pulse.
Various sizes of cavity were produced by varying the sparkgap width, charging potential and the capacity of the condenser.
The spark is discharged shortly before the arrival of the wave a t the sparkgap, and a schlieren photograph is taken after some interval.
It contains an inner conductor, a middle conductor, an outer conductor, and a sparkgap switch.
The gas gap voltage smoothly varied with the change of the main sparkgap.
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