Signals: combined light and sound signal (thunder-light) consisting of 3 single signals which are fired at intervals of approximately one minute (day signal).

Question

combined light and sound signal (thunder-light) consisting of 3 single signals which are fired at intervals of approximately one minute (day signal).

Sophie March · Accepted Answer

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Combined light and sound signal (thunder-light) consisting of 3 single signals which are fired at intervals of approximately one minute (day signal).