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 624
eature of the equipment is doubt-less the aerial or antenna, which is the elevated wire used toemit or intercept electric waves. The aerial usually con-sists of four or more parallel wires running up nearly verticallyinto the air and usually connected to a set of horizontal wires,as shown in figure… … Fig. 409. — Helix of oscillation trans-former. with a flat top 140 feet in length and 136 feet above the operat-ing room; this gives a total length of 276 feet and a naturalwave length of 330 meters. The oscillation transformercommonly consists of a largehelix made of copper ribbonmounted on an…
Electricity · Magnetism
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