nstructed The tunnels and stations were to be of the following as described above, but surrounded by a metallic frame- of 5 meters (16.4 feet) in such a manner that the cais- types: The tunnels were to be two in number, circular in work which shall serve as the caisson, thus enabling son could be… … THE TUNNEL UNDER THE SEINE RIVER. had been driven, against -which the caisson rested. the caisson are composed of sheets of iron attached to lined with metal. Each tunnel was to have an internal These piles formed the first part of a solid stockade of the framework surrounding the steel lining of…
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