London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 528
multiplied by 20 (the number of tonswhich 1 lb. in the model represents), gives 120 tons; thereforeproving most satisfactorily that the strength of this bridge ismany times greater than the weight of any load which can pos-sibly be drawn over it; and this, too, independently of the twobanks, which… … tending l-iO ft. in span ; the rise, or altitude, being 35 ft. Thearch forms the segment of a circle, the diameter of which is170 ft. It was completed in the year 1755. (See Malkins SouthWales.) The engraving is correct in the proportions of span and riseof this famous arch, having d and g, the…
Architecture
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