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Jon Gnagy (January 13, 1907 – March 7, 1981) was a self-taught artist most remembered for being America's original television art instructor, hosting You Are an Artist, which began on the NBC network and included analysis of paintings from the Museum of Modern Art, and his later syndicated Learn to Draw series.
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]
The Brown truss enjoyed a brief period of favor in the 1860s, and is known to have been used in four covered bridges in Michigan, the Ada Covered Bridge, the Fallasburg Bridge, Whites Bridge and one other. The design did not appear to gain wide acceptance as modern bridges tend to be Howe, Pratt, bowstring or Warren trusses.
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]
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.
Examples of truss construction on covered bridges include Howe, Town Lattice, Queen-post, King-post, Haupt, Burr, Brown and Pratt. Of the existing historic covered bridges in Alabama, the Gilliland-Reese Covered Bridge and the Old Union Crossing Covered Bridge are classified as non-authentic based on their current construction.
Only bridge in the US using this design [6] Pisgah Community Covered Bridge [1] Randolph: Pisgah: ca. 1910: 51 feet (16 m) Upper branch of the Little River Private: Modified queen: Will Henry Stevens Covered Bridge [7]: 61 Macon: Highlands
The World Guide to Covered Bridges is published by the National Society for the Preservation of Covered Bridges (NSPCB). [1] It uses a covered bridge numbering system developed by John Diehl, the chairman of the Ohio Covered Bridge Committee. The committee first used the numbering system in 1953 to publish a list of covered bridges in Ohio. [2]