Elementary treatise on electricity and magnetism : (1905)
Foster, G. C. (George Carey), 1835-1919, Joubert, J. (Jules François), 1834-1910, Porter, Alfred W. (Alfred William), 1863-1939 · London ; New York ; Bombay : Longmans, Green, and Co. · leaf 565
is equal to twice the height of theconductor. In the erection of lightning conductors, and in instructionsdrawn up for this purpose, the case a has alone been taken intoconsideration, and even within these restricted conditions it doesnot appear that suflicient allowance has ever been made for… … Fig. 367. 544 ATMOSPHERIC ELECTRICITY [478- rod. The relative advantages of copper and iron have frequentlybeen discussed. Iron appears preferable if magnetic permeabilitydoes not come into play. The experience of more than a centuryshows that Fianklins lightning conductor is an efficient…
Electricity · Magnetism
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