Put into a middling-sized bottle, with a short wide neck, three ounces
of oil or spirit of vitriol, with twelve ounces of common water, and
throw into it, at different times, an ounce or two of iron filings. A
violent commotion will then take place, and white vapours will arise
from the mixture. If a taper be held to the mouth of the bottle, these
vapours will inflame and produce a violent explosion, which may be
repeated as long as the vapours continue.