| 摘要 |
An electrical igniter or fuse includes an electrically energized igniting means, an energizing circuit therefore and a condenser connected in the energizing circuit and acting as an electrical energy storage means. Normally open switch means are in series in the energizing circuit and are closed at a preselected time to discharge the condenser through the igniting means. A charging circuit for the condenser includes disengageable contacts for temporary connection to an extraneous source of potential to charge the condenser, and a spark gap switching means is interposed in the charging circuit between the condenser and the disengageable contacts. The extraneous source of potential has a potential higher than the firing potential of the glow tube constituting the spark gap switching means, and the condenser is charged to a potential lower than such firing potential. Thereby, when the contacts are disengaged from the potential source, shorting of the contacts will not effect discharge of the condenser.
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