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 I think, a conductor of metal less than six or eight inches in breadth, and a quarter of an inch in thickness (or an equal quantity of metal in any other form that maybe found more convenient) cannot with safety be depended on, where buildings are exposed to the reception of so great a quantity of lightning. These are the only points in which I have ventured to differ from Dr. Franklyn.

I shall not think my time ill employed, if these observations contribute to our security against the effects of lightning. Certainly an inquiry into the properties of the electric fluid, as it furnishes us with the means of preventing such accidents, is far from being an useless speculation. I am,

Sir,

your most humble servant,

Edward Delaval. Rh