For threes.... Some fuze, some firecrackers, and wax. THAT might work-splice the little fuses into the big one, spaced for 2 second intervals, coated in wax. But I think I'd rather carry a metal cup under each of my nalgenes and a whistle- I can be noisy on my own. :P
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-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.