teel that entered the arch. How- stratum of Clinton limestone, but this was found im- the Pennsylvania Steel Company, of Steelton, Pa., ever, the engineer in charge of the work was Mr. L. L. possible on the Canadian side, where a foundation of Buck, who is the chief engineer of the Niagara Falls… … the blue marl encountered hinged to the arch by a pin became so compact that the at the intersection of the end diamond drill had to be used, post and top chord of the and under the action of the arch, while the shore end water the marl swelled to rests on expansion rollers, such a degree that the…
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