Best method of securing a powder magazine from lightning. 375

Of lightning, and the methods (now used in America) of securing

buildings and persons from its mischievous effects. 377

St. Bride's steeple.--Utility of electrical conductors to

Steeples.--Singular kind of glass tube. 382

Experiments, observations, and facts, tending to support the

opinion of the utility of long pointed rods, for securing

buildings from damage by strokes of lightning. 383

The Complete Works in Philosophy, Politics and Morals of the late Dr. Benjamin Franklin, Vol. 1 [of 3] · 第 19 / 291 题