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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.
A water level device showing both ends at the same height. A water level (Greek: Aλφαδολάστιχο or (υδροστάθμη) [Alfadolasticho]) is a siphon utilizing two or more parts of the liquid water surface to establish a local horizontal line or plane of reference.
By the time of the Second Geodetic Levelling (1912–1921) the importance of stability was better appreciated and so it was decided to use Fundamental Bench Marks (FBMs) installed in solid rock, rather than on buildings as before. To measure average MSL around Great Britain three tide gauges were employed: at Dunbar, Newlyn and Felixstowe ...
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Following is a list of dams and reservoirs in Pennsylvania.. All major dams are linked below. The National Inventory of Dams defines any "major dam" as being 50 feet (15 m) tall with a storage capacity of at least 5,000 acre-feet (6,200,000 m 3), or of any height with a storage capacity of 25,000 acre-feet (31,000,000 m 3).
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Helene, the strongest hurricane on record to slam into Florida’s Big Bend region, is now a post-tropical cyclone with winds of 35 mph, leaving at least 59 people dead in five states, leveling ...
The Fairmount Water Works was initially constructed between 1812 and 1815 on the east bank of the Schuylkill River.The Water Works initially consisted of a 3 million US gallons (11,000,000 L) earthen reservoir atop Faire Mount at the present site of the Philadelphia Museum of Art, and a pump house with two steam engines to pump water.