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Page 3 - I have the honor to be, very respectfully, your obedient servant, AA HUMPHREYS, Brigadier General and Chief of Engineers. Hon.
Page 3 - General and Chief of Engineers, Hon. WW BELKNAP, Secretary of War. Approved by the Secretary of War, JANUARY 3, 1873.
Page 10 - The mason was convinced that the opinion was correct, and the superintendent declared he had long been apprehensive of the consequences. " At length the critical period arrived when it appeared highly probable that another day's work would have defeated the whole enterprise. It was known that nothing but actual perception of the consequences would bring conviction ; which all reasoning (resisted by the strong desire to reach the rock) had failed to produce. Several of the stoutest laborers were set...
Page 10 - ... its thickness before a column of water, copious and alarming, suddenly gushed up ; this produced an immediate conviction of the unjustifiable hazard of any further attempt to bare the rock; and the factitious foundation, being without further hesitation agreed to, was forthwith commenced...
Page 7 - Having no instructions on this point, we were left entirely to the guidance of our own judgment, and to the influence of the facts which my survey and examinations of the site of the work had brought to view, and these were such as to induce us to give to the plan a character of the utmost stability as it respected the foundations, and one of equal durability to the superstructure. It was to consist of twelve arches of stone, supported by eleven piers and two abutments; the arches to be 100 feet...
Page 5 - I have the honor to report that, immediately on the receipt of your order of the 29th of August, 1832, concerning the Potomac aqueduct, I communicated the same to TF Mason, esq., the president of the Alexandria Canal Company ; and I soon after made the necessary examinations to enable me to determine the proper position of, the extent, character, and cost of the work. By these surveys were ascertained the...
Page 1 - Report on the construction of the piers of the aqueduct of the Alexandria Canal across the Potomac River at Georgetown, DC, 1885-1*10. William Turnbull. Wash.. 1873. 49 pp., 8 pi., 12 x 9, cl. Report on the survey and construction of the Potomac Aqueduct.
Page 18 - ... notwithstanding this conviction, it was not very pleasant to recollect that the other dam (No. 1) was constructed upon precisely the same plan as this, and that consequently the same. difficulties might be reasonably anticipated with respect to it. But I now felt quite convinced that by perseverance all difficulties could be overcome, and the ultimate success of the work insured. I was very much encouraged, also, by the confidence of the president and directors and their advice to persevere....
Page 7 - ... feet thick. This plan was approved of by the president and directors, with the exception of the superstructure, the cost of which, being beyond the limited means of the company, was left for after consideration. The plan was further altered by rejecting the abutment-piers ; but eventually these were restored on the recommendation of the engineers.
Page 5 - Influenced by the decided superiority of this line over that selected by Messrs. Wright and Roberts, and coinciding in this opinion with Mr. Fairfax, the engineer of the Alexandria Canal Company, with whom" I at that period acted, we applied to the mayor of Georgetown for the consent of that corporation to use that street as the northern abutment of the aqueduct, and we suggested to him the idea that it might be of advantage to the town to unite with the Alexandrians in constructing a roadway upon...

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