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When a good metallic connection is made between a metal roof and metal rain-conductors, which, in their turn, are well connected with the earth, nothing further is needed for complete protection than a rod soldered to the roof for each chimney or other projection.
Especially is it important to connect with a metallic roof at its lower edge, and with the gutters, unless the rain-conductors connect with the earth to its moist mass. In regard to the material for conductors, copper is undoubtedly the best, but more expensive than iron. The latter is more liable to rust, and on account of its lower conductive power is more easily melted.
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