A truss bridge is a bridge whose load-bearing superstructure is composed of a truss, a structure of connected elements usually forming triangular units. The connected elements may be stressed from tension, compression, or sometimes both in response to dynamic loads. Truss bridges are one of the oldest types of modern bridges. The basic types of truss bridges shown in this article have simple designs which could be easily analyzed by 19th and early 20th-century engineers. A truss bridge is economical to construct because it uses materials efficiently.
A lattice bridge is a form of truss bridge that uses a large number of small and closely spaced diagonal elements that form a lattice. Bridges of this type were patented in the 19th century by architect Ithiel Town, and are sometimes called Town lattice trusses.
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. Sixty-six of the 67 counties in Pennsylvania have listings on the National Register; Cameron County is the only county without any sites listed.
The Burr Arch Truss—or, simply, Burr Truss or Burr Arch—is a combination of an arch and a multiple kingpost truss design. It was invented in 1804 by Theodore Burr, patented on April 3, 1817, and used in bridges, usually covered bridges.
The Cornish–Windsor Covered Bridge is a one hundred and fifty-three-year-old, two-span, timber King-truss, interstate, covered bridge that crosses the Connecticut River between Cornish, New Hampshire, and Windsor, Vermont. Until 2008, when the Smolen–Gulf Bridge opened in Ohio, it had been the longest covered bridge in the United States.
Ear clearing or clearing the ears or equalization is any of various maneuvers to equalize the pressure in the middle ear with the outside pressure, by letting air enter along the Eustachian tubes, as this does not always happen automatically when the pressure in the middle ear is lower than the outside pressure. This need can arise in scuba diving, freediving/spearfishing, skydiving, fast descent in an aircraft, fast descent in a mine cage, and being put into pressure in a caisson or similar pressure-bearing structure, or sometimes even simply travelling at fast speeds in an automobile.
Old Blenheim Bridge was a wooden covered bridge that spanned Schoharie Creek in North Blenheim, New York, United States. With an open span of 210 feet (64 m), it had the longest span of any surviving single-span covered bridge in the world. The Bridgeport Covered Bridge in Nevada County, California, is longer overall at 233 feet (71 m) but is argued to have a 208 feet (63 m) clear span. The bridge, opened in 1855, was also one of the oldest of its type in the United States. It was destroyed by flooding resulting from Tropical Storm Irene in 2011. Rebuilding of the bridge commenced in 2017 and was completed in 2018.
Shushan Bridge is a covered bridge over the Batten Kill in the hamlet of Shushan in Washington County, New York, near Vermont. It is one of 29 surviving historic covered bridges in New York State, and one of 4 surviving in Washington County.
Buskirk Bridge is a wooden covered bridge and is the name of the hamlet in which it is located. It is in the town of Hoosick. The bridge, which crosses the Hoosic River is one of 29 historic covered bridges in New York State. The bridge takes its name from the nearby hamlet of the same name, which was named after the local Van Buskirk family.
Eagleville Bridge is a covered bridge located at Eagleville in the towns of Jackson and Salem, Washington County, New York. The bridge, which crosses the Battenkill, is one of 29 historic covered bridges in New York State.
Rexleigh Bridge is a wooden covered bridge over the Batten Kill in Washington County, New York. It is one of 29 historic covered bridges in New York State.
Copeland Bridge, also known as Copeland Farm Bridge or Copeland Covered Bridge is a wooden covered bridge over Beecher Creek in the town of Edinburg in Saratoga County, New York. It was built in 1879, and is a small, timber framed, queenpost truss bridge with a gable roof. It has a 30-foot span carried on fieldstone abutments.
The Frenzel Maneuver is named after Hermann Frenzel. The maneuver was developed in 1938 and originally was taught to dive bomber pilots during World War II. The maneuver is used to equalize pressure in the middle ear. Today, the maneuver is also performed by scuba divers, free divers and by passengers on aircraft as they descend.
Roydhouse is a hamlet in the Kirklees district, in the English county of West Yorkshire.
Sir Thomas Morgan, 3rd Baronet was a British landowner and politician who sat in the House of Commons from 1712 to 1716.
