A. Because the dimension of the metal is too small, to afford a path for the electric current.
Q. Why does lightning purify the air?
A. For two reasons: 1st—Because the oxygen and nitrogen of the air combine,[3] and produce “nitric acid:”
2ndly—Because the agitation of the storm stirs up the air.
[3] The oxygen and hydrogen are not combined, but simply mixed in the ordinary air; but the lightning causes the mixed elements to combine.
Q. How does the production of nitric acid purify the air?
A. Nitric acid acts very powerfully in destroying exhalations, arising from putrid vegetable and animal matters.
Q. Why is lightning more common in summer and autumn, than in spring and winter?
A. The heat of summer and autumn produces great evaporation; and the conversion of water to vapour, always develops electricity.