Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 325
age, which could be closed bybarricades when necessary. This bridge wasbuilt of small-sized stones cemented togetherwith a mortar which has become very hard(Fig. 24). The bridge at Orthez in the FrenchPyrenees, built in the twelfth century, hasonly one tall tower. The weight of this towerhas been… … Pont des Trous at Tournai. Fig. 24.
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