R THE SEINE RIVER. their entrance shafts. The walls will be composed of cast-iron rings 60- centi- BY L. KAMAKERS. (Work has been commenced on the construction of meters (2 feet) broad, the rings themselves being (c) Excavation by freezing process will be employed built up of voussoirs of varying… … at the Quai des Tuileries. One of Erection of the First Caisson on the Quai des Tuileries. nouncement of the competition the the illustrations shows the first tunnel descended 40 millimeters to their positions and the pressures to which they are sub- caisson at the moment when the framework was…
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