Abstract
FROM the point of view of stability, measurements of the vibrations of tall chimneys are important, especially in a country like Japan, which is subject to severe earthquakes. Experiments on three chimneys of concrete reinforced by steel rods are described in a valuable paper by Prof. Omori, published in the Bulletin of the Imperial Earthquake Investigation Committee (vol. ix., 1918, pp. 1–29). One of these chimneys, erected by the Kuhara Mining Co. at Saganoseki, is the tallest in the world. It is 550 ft. in height, 42 ft. 8 in. in diameter at the base and 27 ft. 5 in. at the top, the thickness of the wall being 29½ in. at the base and 7 in. at the top. The total weight of the structure, including the foundation, is 9500 tons, and the pressure of the shaft on the ground below is three tons per square foot.
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