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The water level at each end of the tube will be at the same elevation, whether the two ends are adjacent or far apart, so a line between them will be horizontal at its midpoint and a shed base, building foundation or similar structure laid out using several such lines will be "horizontal" within building tolerances on any scale over which use ...
A Philadelphia rod is a level staff used in surveying. The rod is used in levelling procedures to determine elevations and is read using a level. A Philadelphia rod consists of two sliding sections graduated in hundredths of a foot. On the front of the rod the graduation increasing from zero at the bottom.
The Ohio River is a naturally shallow river that was artificially deepened by a series of dams. The natural depth of the river varied from about 3 to 20 feet (1 to 6 m). The dams raise the water level and have turned the river largely into a series of reservoirs, eliminating shallow stretches and allowing for commercial navigation. From its ...
HABS—Historic American Buildings Survey projects in Philadelphia. Pages in category "Historic American Buildings Survey in Philadelphia" The following 197 pages are in this category, out of 197 total.
The Philadelphia skyline as seen from Boathouse Row in June 2019 (annotated version) The Philadelphia skyline as seen from the Delaware River in February 2023 Philadelphia, the largest city in the U.S. state of Pennsylvania, is home to more than 300 completed high-rise buildings and skyscrapers up to 330 feet (101 m), and 58 completed skyscrapers of 330 feet (101 m) or taller, of which 34 are ...
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May 11, 1976 (North Philadelphia Eastern banks of the Schuylkill River: Fairmount Park: First municipal waterworks in the United States. Designed in 1812 by Frederick Graff and built between 1819 and 1822, it operated until 1909.
Health officials in Bucks County, just north of Philadelphia, said Sunday that between 8,100 and 12,000 gallons (30,700 and 120,000 liters) of a water-based latex-finishing solution spilled into ...