onsisted of a 5- foot iron tube, which was carried forward on the line of the axis of the tunnel into the material ahead. This tube was used as a center from which struts were carried out radially, to support the surrounding wall of the tunnel and prevent distortion during the construction of the… … about 5,400 feet. By this system a passenger, landing at any of the Jersey City railroad terminals, will be able to take a train direct to central points between Mr. Haskin commenced the construction of the tun- Forty-second Street and the Battery. nel without the use of the customary shield and…
Elevated · Railroad · Brooklyn · Manhattan · Feet · Supplement · Scientific American · Subway · American supplements · Terminal Station · American supplement · Wireless telegraph · Supporting wheels · Pennsylvania railroad · Street subway · Center street · Motor car
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