Abstract
What is the weight of the Space Needle?
Space Needle
The Space Needle is an observation tower in Seattle, Washington, a landmark of the Pacific Northwest, and a symbol of Seattle. Built in the Seattle Center for the 1962 World's Fair, which drew over 2.3 million visitors, nearly 20,000 people a day used its elevators. Once the tallest structure west of the Mississippi River, it is high, wide, and weighs 9,550 tons. It is built to withstand winds of up to and earthquakes of up to 9.1 magnitude, as strong as the 1700 Cascadia earthquake. It also has 25 lightning rods. It has an observation deck at and a gift shop with the rotating SkyCity restaurant at . From the top of the Needle, one can see not only the downtown Seattle skyline but also the Olympic and Cascade Mountains, Mount Rainier, Mount Baker, Elliott Bay, and surrounding islands. Photographs of the Seattle skyline often show the Space Needle prominently, above the rest of the skyscrapers and Mount Rainier. Visitors can reach the top of the Space Needle by elevators that travel at . The trip takes 41 seconds, and some tourists wait in hour-long lines. On windy days, the elevators slow to . On April 19, 1999, the city's Landmarks Preservation Board designated it a historic landmark.