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A covered bridge is a timber-truss bridge with a roof, decking, and siding, which in most covered bridges create an almost complete enclosure. [1]
A lattice truss bridge is a form of truss bridge that uses many small, closely spaced diagonal elements forming a lattice. The design was patented in 1820 by architect Ithiel Town .
Covered bridges made with stringers instead of traditional style trusses are considered non-authentic, although in some terms, a stringer construction is also a type of truss. Examples of truss construction on covered bridges include Howe, Town Lattice , Queen-post , King-post , Haupt, Burr , Brown and Pratt.
The design principle behind the Burr arch truss is that the arch should be capable of bearing the entire load on the bridge while the truss keeps the bridge rigid. Even though the kingpost truss alone is capable of bearing a load, this was done because it is impossible to evenly balance a dynamic load crossing the bridge between the two parts. [5]
Peter Paddleford (1785–1859) was a covered bridge builder who designed a new wooden bridge truss, one he never patented. The design was used widely throughout New Hampshire, Maine, and Eastern Vermont during much of the 19th century.
This 86.5-foot-long (26.4 m), 18.66-foot-wide (5.69 m), Howe truss bridge was built in 1855. It was renovated by the Works Progress Administration in 1939, and by the city of Philadelphia in 2000. [2] It is the only remaining covered bridge in Philadelphia and is the only covered bridge in a major US city.
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In technical drawing and computer graphics, a multiview projection is a technique of illustration by which a standardized series of orthographic two-dimensional pictures are constructed to represent the form of a three-dimensional object.