d ahead. This tube was used as a the purpose of carrying through the great undertaking, long communication beneath the river will be estab- and they hav« prosecuted it with such vigor that the center from which braces were carried out radially lished. The tunnel will provide communication be- north… … View in Rear of Shield at Heading:, Showing Full Diameter of Tunnel (19 Feet 4 Inches;. Both tunnels are be- an easy grade toward their deepest level, which lies in ing built by the Great- the proximity of the Manhattan shore. The New York head shield system and lined with a cast-iron shell…
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