the proper size, and are material, is proved by experience in other cases; and gave a great impulse to the erection of bridges on the subsequently ground to the required form. the real cause appears to have been the too great lightness of the structure altogether. The Wheeling Bridge onlj weighed… … TURNING THE STONES. PACKING THE STONES. as absolutely terrific: one spectator estimated it at same principle, and though its dimensions have since The machine for grinding these stones into the de- hejsn far surpassed, if it be considered with ref- twenty feet, an amount almost incredible, and…
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