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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