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The majority of the firms consider that the area protected has a radius equal to the height of the conductor; but one firm considers that this should be multiplied by five or six times; while another asserts, “that no appreciable extent is protected by a single rod conductor;” and another, that “many instances may be related of buildings being struck much within the radius of well protected churches or chimneys.”

We have no experience at present to enable us to form a definite opinion on this point. The Committee of the French Academy, gave the radius as equal to twice the height of the conductor from the ground, but buildings have undoubtedly been injured within this limit. The writer does not think that a greater radius than the height should be taken: but thinks that this is one of the most important questions that the Conference could determine. Calculation might, to a certain extent, settle the point: but it is more a case for experience.