Читать книгу Lightning Rod Conference - Various - Страница 22

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Some attach the conductor to the building by copper straps and nails; some use holdfasts, either of copper wire or gun metal; others use staples; one uses metallic ties. Several pass the conductor through insulators of glass, porcelain, or earthenware. But the majority discard insulators as useless.

In the opinion of the writer they are quite right, for it is difficult to understand what useful function the insulator performs. One fact that occurred in 1837 is given as a reason for their use, but the fact militates against the efficiency of the conductor rather than the absence of insulators. If the conductor were perfect there could have been no concussion at the point of attachment. If it were imperfect there may have been, for the discharge would seek other paths to earth. Some manufacturers use holdfasts of a different metal to that of the conductor. This is wrong, for where different metals are used galvanic action sets in, tending to decay and rupture. The attachments for this reason should always be of the same metal as the conductor.