ans were slightly modified. The caisson there at the foot of Morton Street, New York, and Fifteenth Street, Jersey City, where the approaches begin that as in the case of the other. will extend the tunnel at an easy grade to the surface. usual locks for men and material. Work was commenced at the… … hydraulic jacks until its inner end projected a short dis- the airas compared with silt. The sand at the bottom of the plates is parallel with the heading. The plates are tance beyond the face of the wall. The lock was then the caisson was dug out,,and ineachsmall excavation as supported from the…
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