Retrieved October 22, 2009.
The area at the base of the second phase foundation is 15,992 square feet (1,485.7 m2).
Two stones, each one course high, are mounted on each of the four ribs, supporting two additional courses above the cruciform keystone, leaving two courses to support the capstone's weight by themselves.82 Some stone pieces saved during the 2011 inspection will be refastened to the monument, while "Dutchman patches" n 6 will be used in other places.Forty eight American flags (one for each state then in existence) upload und geschwindigkeit testen were flown on wooden flag poles on Washington's birthday since 1920 and later on Independence Day, Memorial Day, and other special occasions until early 1958.Check for warrant psn promotion codes # Dj pro corel videostudio pro x2 free this.33 :85 99 :80 The marble pyramidion has an extremely complex construction to save weight yet remain strong.Christopher Hodapp (January 13, 2010).Assessed August 26, 2011.The perimeter of the original top step of the old rubble foundation rests on the larger top of the concrete buttress.In 1934 these eight short points were lengthened to extend them above the apex by 6 inches (15 cm).66 On September 7, 2004 the monument closed for a 15 million renovation, which included numerous security upgrades and redesign of the monument grounds by landscape architect Laurie Olin.Six months later on June 5, 1885 lightning damaged the marble blocks of the pyramidion, 96 so a net of gold-plated copper rods supporting 200 3-inch (7.6 cm) gold-plated, platinum-tipped copper points spaced every 5 feet (1.5 m) was installed over the entire pyramidion.
A b c "Aerial America: Washington.C.".
"Washington Monument attacked by Geological Tuberculosis" Archived September 2, 2016, at the Wayback Machine.
Pfanz, Donald., National Park Service, National Capital Region (December 2, 1980).
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Retrieved March 7, 2014.Retrieved July 10, 2008.554 feet 11 12 inches (169.151 m) according to architectural drawings in the Historic American Buildings Survey (1994 pavement at shaft to tip.N 2 The tallest masonry structure in the world is the Anaconda Smelter Stack in Montana at 585 feet 1 12 inches (178.346 m).Paul Schwartzman (March 19, 2005).It has a large vertical hole through which.5-inch (3.8 cm) threaded copper rod passes and screws into the base of the apex, which used to form part of its lightning protection system.