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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 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 ...
NAVD 88 was established in 1991 by the minimum-constraint adjustment of geodetic leveling observations in Canada, the United States, and Mexico.It held fixed the height of the primary tide gauge benchmark, referenced to the International Great Lakes Datum of 1985 local mean sea level (MSL) height value, at Rimouski, Quebec, Canada.
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.
Upon completion, the high-rise was the tallest building constructed in Philadelphia since the early 1930s. [2] [3] The rectangular building was 243 feet (74 m) long and 92 feet (28 m) wide, and contained 756,000 square feet (70,000 m 2). Of the thirty-eight floors, thirty-six were occupiable and two were mechanical floors. The structure also ...
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 ...
The East Center City Commercial Historic District is a national historic district located in the Washington Square neighborhood of Philadelphia, Pennsylvania.It encompasses 287 contributing structures, including large and small commercial buildings, banks, hotels, newspapers, clubs, and restaurants.
The reference water levels are used on inland waterways to define a range of water levels allowing the full use of the waterway for navigation. [1] Ship passage can be limited by the water levels that are too low, when the fairway might become too shallow for large ("target", "design") ships, or too high, when it might become impossible for the target ships to pass under the bridges. [1]