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 477
Fig. 299. — Steel tower withsuspension insulator. 424 ELECTRICITY AND MAGNETISM … Fig which is insulated with rubber or with paper impregnated witha compound such as resin oil and then sheathed with lead to keep out the moisture and toprotect the cable against me-chanical injury. The cablemust be flexible enough tobend around corners, for it isdrawn into tile ducts…
Electricity · Magnetism
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