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Harper's Encyclopedia of United States History (ed. Benson Lossing) 2 0 Browse Search
Southern Historical Society Papers, Volume 28. (ed. Reverend J. William Jones) 2 0 Browse Search
The writings of John Greenleaf Whittier, Volume 3. (ed. John Greenleaf Whittier) 2 0 Browse Search
Joseph T. Derry , A. M. , Author of School History of the United States; Story of the Confederate War, etc., Confederate Military History, a library of Confederate States Military History: Volume 6, Georgia (ed. Clement Anselm Evans) 1 1 Browse Search
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Browsing named entities in Harper's Encyclopedia of United States History (ed. Benson Lossing). You can also browse the collection for Pecos (Texas, United States) or search for Pecos (Texas, United States) in all documents.

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Harper's Encyclopedia of United States History (ed. Benson Lossing), Engineering. (search)
r. The modern high office building is an interesting example of the evolution of a high-viaduct pier. Such a pier of the required dimensions, strengthened by more columns strong enough to carry many floors, is the skeleton frame. Enclose the sides with brick, stone, or terra-cotta, add windows, and doors, and elevators, and it is complete. Fortunately for the stability of these high buildings, the effect of wind pressures had been studied in this country in the designs of the Kinzua, Pecos, and other high viaducts. The modern elevated railway of cities is simply a very long railway viaduct. Some idea may be gained of the life of a modern riveted-iron structure from the experience of the Manhattan Elevated Railway of New York. These roads were built in 1878-79 to carry uniform loads of 1,600 lbs. per lineal foot, except Second Avenue, which was made to carry 2,000. The stresses were below 10,000 lbs. Per square inch. These viaducts have carried in twenty-two years over