R THE SEINE RIVER. their entrance shafts. The walls will be composed of cast-iron rings 60. centi- BY L. RAMAKERS, ‘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 nouncement of the competition the the illustrations shows the first tunnel descended 40 millimeters to caisson at the moment when the framework was com- their positions and the pressures to which they are sub- the meter (4 to 100) to a point vertically under the…
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