第66章知识
work. trees were selected, cut down, stripped of their branches, and cut into beams, joists, and planks. the end of the bridge which rested on the right bank of the mercy was to be firm, but the other end on the left bank was to be movable, so that it might be raised by means of a counterpoise, as some canal bridges are managed.
this was certainly a considerable work, and though it was skillfully conducted, it took some time, for the mercy at this place was eighty feet wide. it was theref
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