Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 292
quite simple and readily understood. Let us assume in Fig. i that A is a small sur-face of water. Drop a stone at B. A series ofwidening circles or waves will spread out in alldirections until they give up their energy at theedge of the little pond. If we drop bits of corkat C, D, E, and F, they… … DIAGRAMS ILIASTKA riNG THIi PlilNCULES OFWIRELESS TELEGRAPHY. every direction by waves in the water and affectsany cork within the radius of these waves. Wireless telegraphy works on just this prin-ciple. The dropping stone represents the send-ing-station. The corks represent the receivingstations,…
Children's literature
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