A Maryland Historical Society curator discusses the exhibit that showcases the surveying community’s “Holy Grail”—the original 1768 Mason- Dixon map—and a surveyor examines the 80-year boundary dispute behind it and the history-making geodetic survey that followed.
Like airplanes, skyscrapers, dams and other large engineered structures, bridges constantly deform by design and by necessity. All modern bridges, for example, contain expansion joints to ensure that thermal expansion and contraction will not buckle the bridge or tear it apart. Following the wind-induced collapse of Washington’s Tacoma Narrows Bridge in November 1940, structural design engineers have taken considerable care to ensure that wind stresses will not trigger destructive mechanical resonances in suspension bridges.
In an effort to identify the most current salary levels and benefit trends for surveying and mapping professionals, this year POB partnered with Clear Seas Research to conduct a comprehensive, quantitative study, which POB will publish on an annual basis.
