A suspension bridge is a type of bridge in which the deck is hung below suspension cables on vertical suspenders. The first modern examples of this type of bridge were built in the early 1800s. Simple suspension bridges, which lack vertical suspenders, have a long history in many mountainous parts of the world.
Westmoreland County is a county in the Commonwealth of Pennsylvania, United States, located in the Pittsburgh Metropolitan Statistical Area. As of the 2020 census, the population was 354,663. The county seat is Greensburg and the most populous community is Hempfield Township. It is named after Westmorland, a historic county of England.
Mount Pleasant is a borough in Westmoreland County, Pennsylvania, United States. It stands 45 miles (72 km) southeast of Pittsburgh. As of the 2020 census, the borough's population was 4,245.
Mount Pleasant Township is a township in Westmoreland County, Pennsylvania, United States. As of the 2020 census, the township population was 10,101. Mount Pleasant Township should not be confused with the Borough of Mount Pleasant, which is a separate municipality and comprises the town of that name.
The Village of Valley Forge is an unincorporated settlement. It is located on the west side of Valley Forge National Historical Park at the confluence of Valley Creek and the Schuylkill River in Pennsylvania. The remaining village is in Schuylkill Township of Chester County. It once spanned Valley Creek into Montgomery County. The name Valley Forge is often used to refer to anywhere in the general vicinity of the park. Many places will use the name even though they are actually in King of Prussia, Trooper, Oaks, and other nearby communities. This leads to some ambiguity on the actual location of the modern village. There is a partial re-creation of the historic village from the time of the American Revolution that is located just within the outskirts of the park.
The year 1801 in science and technology involved some significant events, listed below.
The Schuylkill River is a river running northwest to southeast in eastern Pennsylvania. The river was improved by navigations into the Schuylkill Canal, and several of its tributaries drain major parts of Pennsylvania's Coal Region. It flows for 135 miles (217 km) from Pottsville to Philadelphia, where it joins the Delaware River as one of its largest tributaries.
A simple suspension bridge is a primitive type of bridge in which the deck of the bridge lies on two parallel load-bearing cables that are anchored at either end. They have no towers or piers. The cables follow a shallow downward catenary arc which moves in response to dynamic loads on the bridge deck.
This is a list of properties and districts listed on the National Register of Historic Places in Pennsylvania. As of 2015, there are over 3,000 listed sites in Pennsylvania. All 67 counties in Pennsylvania have listings on the National Register.
Regions of Pennsylvania in the United States include:
James Finley was an American Presbyterian minister and politician who was a pioneer resident of Western Pennsylvania. Either he or his wife owned the house in which Thomas Jefferson began his first attempt to draft the United States Declaration of Independence.
James Finley, aka Judge James Finley, is widely recognized as the first designer and builder of the modern suspension bridge. Born in Ireland, Finley moved to a 287-acre (1.16 km2) farm in Fayette County, Pennsylvania, near Uniontown. Elected a justice of the peace in 1784, he went on to become county commissioner in 1789, and a member of the Pennsylvania House of Representatives and Senate. From 1791 until his death, he was an Associate Judge for Fayette County.
His Jacob's Creek Bridge, built in 1801 for US$600, and demolished in 1833, was the first example of a suspension bridge using wrought iron chains and with a level deck. It connected Uniontown to Greensburg, spanning 70 feet, and was 12 feet 6 inches (3.81 m) wide.
Finley is also credited with designing and constructing a chain suspension bridge across Dunlap's Creek in Brownsville, Pennsylvania, in 1809. In 1820, however, the bridge collapsed under a heavy snow combined with the loads from a six-horse wagon team. The bridge was replaced by the Dunlap's Creek Bridge, the country's first cast-iron bridge, in 1835.
Jacobs Creek is a 33.4-mile-long (53.8 km) tributary of the Youghiogheny River beginning in Acme, Pennsylvania and draining at its mouth in the town of Jacobs Creek into the Youghiogheny River. Jacobs Creek is the southwestern border of Westmoreland County and the northwestern border of Fayette County. The area was a major producer of rye whiskey in the decades before Prohibition.
The Isaac Meason House, also known as Mount Braddock, is a historic house located in Dunbar Township, Fayette County, Pennsylvania. Completed in 1802, it is one of only two surviving Palladian style stone mansions from the period in the United States. Isaac Meason, for whom it was built, was an American Revolutionary War hero and early political power broker in the area, becoming the richest person in Fayette County due to his interest in iron furnaces. The house was designated a National Historic Landmark in 1990 for its architecture.
The Chain Bridge in Newburyport, Massachusetts, is a "look-alike" replica built in 1910 to replace the "first suspension bridge" constructed in the United States in 1810. Since the current structure is one of a series of bridges at this location since 1793, it is "the oldest continually occupied, long span, bridge crossing" in the US. It has also been called the Essex-Merrimac Bridge or Newburyport Chain Bridge.
Spring Garden Street Bridge is a highway bridge in Philadelphia, Pennsylvania. It crosses the Schuylkill River below Fairmount Dam and connects West Philadelphia to the Philadelphia Museum of Art and Benjamin Franklin Parkway. It is the fourth bridge at this location.
Spider Bridge at Falls of Schuylkill was an iron-wire footbridge erected in 1816 over the Schuylkill River, north of Philadelphia, Pennsylvania. Though a modest and temporary structure, it is thought to have been the first wire-cable suspension bridge in the world.
Chain Bridge at Falls of Schuylkill was an 1808 iron-chain suspension bridge built across the Schuylkill River, north of Philadelphia, Pennsylvania. Designed by inventor James Finley, it became the model for his later chain suspension bridges. It collapsed in 1816 under a heavy load of snow.
The Chain Bridge is a pedestrian chain bridge in Nuremberg, Germany. The bridge crosses the river Pegnitz just a few meters upriver of Fronveste and Schlayerturm, fortifications in the course of the medieval city wall guarding the river's exit from the town. It connects Maxplatz in Sebalder Altstadt with Untere Kreuzgasse in Lorenz, the quarter on the south side of the river.
A suspended structure is a structure which is supported by cables coming from beams or trusses which sit atop a concrete center column or core. The design allows the walls, roof and cantilevered floors to be supported entirely by cables and a center column.
