An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 49
32 ELECTRICITY AND MAGNETISM We ordinarily restrict the term conductor to the metalsand to carbon in the forms of charcoal, coke, and graphite.The materials in the table numbered from 3 to 6 may becalled partial conductors/ and the last eleven materials maybe called insulators. Of all the materials… … Fig. 17. — A bell circuit in a house. But even dry air, when under the stress of very high voltages,becomes a partial conductor. Chemically pure water and ice are practically nonconductors.The presence of a very slight percentage of impurities, however,renders water a partial conductor. Since water…
Electricity · Magnetism
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