Gunpowder Exploded By Reflection

Place two concave mirrors at about 12 or 15 feet distance from each

other, and let the axis of each be in the same line. In the focus of

one of them place a live coal, and in the focus of the other place

some gunpowder. With a pair of double bellows, which make a continual

blast, keep constantly blowing the coal, and notwithstanding the

distance between them, the powder will presently take fire.

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