. The earth and its inhabitants ... Geography. HYDEOGRAPHY. 465 piles, and covered with fascines and rush mats. The wood is concealed beneath an armour of flat-headed nails, so that teredo worms may find no crevice to lodge in. The ballast consists of huge blocks of granite, brought at great expense from the interior or from Norway. As a rule these dykes are about 30 feet in height, and between 1Ô0 and 350 feet in thickness. Their construction was all the more Fig. 260.—The Zuiderpoldeer now. Scale I : 76, 1 Mile. difficult as, owing to the depth of the alluvial deposits, it is quite impo
. The earth and its inhabitants ... Geography. HYDEOGRAPHY. 465 piles, and covered with fascines and rush mats. The wood is concealed beneath an armour of flat-headed nails, so that teredo worms may find no crevice to lodge in. The ballast consists of huge blocks of granite, brought at great expense from the interior or from Norway. As a rule these dykes are about 30 feet in height, and between 1Ô0 and 350 feet in thickness. Their construction was all the more Fig. 260.—The Zuiderpoldeer now. Scale I : 76, 1 Mile. difficult as, owing to the depth of the alluvial deposits, it is quite impossible to secure solid foundations in Holland. The dykes are as a rule maintained by the landed proprietors. The expense is very considerable, especially when projecting groins have to be added as a defence against undermining currents. When a dyke, in spite of all, threatens to 105. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Reclus, Elisée, 1830-1905; Ravenstein, Ernest George, 1834-1913; Keane, A. H. (Augustus Henry), 1833-1912. New York, D. Appleton and company
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Keywords: ., bookcentury1800, bookdecade18, booksubjectgeography, bookyear1883
