The English Channel. Longitudinal section of the submarine tunnel between France and England (Dover side). 1- Artificial dike, with vertical inlet leading to the tunnel. 2- Permeable slate layer. 3- Sea level. 4- Compact and waterproof layer of slate. 5- Clay layer, waterproof. 6- Layer of sand, permeable. 7- Vertical entrance to the tunnel. 8- Tunnel. Engraving. La Ilustraci?n Espa?ola y Americana, 1882.

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達志影像

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