down with heavy iron rammers into a compact mass. filled with concrete and heavily rammed. The block was allowed to remain in the framework for task, therefore, of this great structure is to restrain an The bed rock foundation having been thus carefully several days, or until the moisture had… … was procured in tifically exploited, unlimited quanti- and hundreds of ties, only a mile borings, some to a away from the depth of 100 feet, paratory to laying the foundation the whole bottom and sides of the canon were cleared of all soil and vege- A great framework consisting of three platforms…
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