Journal of the Society of Motion Picture and Television Engineers (1950-1954)

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High Steatite Hole HO.+ Fig. 2. Modified Libessart pinpoint spark-gap. v1000 v Car, coil or pulse. tr<*nj former Hi gh voltage generator Spark generator Fig. 3. Circuit diagram of spark generator for single shadowgraphic exposures. about 0.5 mm in diameter is essential: it guides the discharge channel so that light may be effectively emitted through the anode hole. Nevertheless, the light source is not a perfect uniformly illuminated circle; there is always a maximum of brightness at some random point on the edge of the anode circle. The discharge is initiated by applying a 15-kv pulse to the control electrode, which takes the form of a ring insulated from the anode by a plyglass cylinder. In order to reduce as much as possible the self-inductance of the discharge circuit, the spark-gap assembly is mounted directly across the spark Fayolle and Naslin: High-Speed Photography 605