 | Thomas Jefferson - 2004 - 178 strani
...is, by some admeasurements, 270 feet deep, by others only 205. Its breadth in the middle is about 60 feet, but more at the ends, and the thickness of the mass, at the summit of the arch, about 40 feet. A part of this thickness is constituted by a coat of earth, which gives growth to many large... | |
 | Michael P. Branch - 2004 - 444 strani
...determines the length of the bridge, and its height from the water. Its breadth in the middle, is about 60 feet, but more at the ends, and the thickness of the mass at the summit of the arch, about4O feet. A part of this thickness is constituted by a coat of earth, which gives growth to many... | |
 | Joseph Emerson Worcester - 1823 - 478 strani
...determines the length of the bridge and its height from the water. Its breadth in the middle is about 60 feet, but more at the ends, and the thickness of the mass at the • summit of the arch, about 40 feet. A part of this thickness is constituted by a coat of earth, which gives growth to many large... | |
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... feet. A part of this thickness is constituted by a coat of earth, which gives growth to many large trees. The residue, with the hill on both sides, is one solid rock of limestone. 
