| 摘要 |
Means for directing a spark from the secondary winding of a spark coil to one of two spark gaps connected thereto. The primary winding of the coil can be connected to a battery so that the core of the coil is magnetised in either one of two directions. Depending on this direction, one or the other of the two spark gaps is fired, by series or shunt diodes. Means are provided for damping out undesirable oscillations which may occur when the primary circuit is broken.
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