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The construction of Mount Rushmore National Memorial took 14 years, from 1927 to 1941. ==Designing the monument== Doane Robinson of the South Dakota Historical Society wanted a monument to be built in South Dakota in order to help the economy of the state by attracting tourism. In 1923, he proposed that this monument should be built from the granite cliffs in the Black Hills of South Dakota. Senator Peter Norbeck of South Dakota approved the proposal, and federal funding helped the project. Robinson asked architect and sculptor Gutzon Borglum to sculpt and design the monument. Borglum decided to use Mount Rushmore for the sculpture, since it seemed to be the easiest and stable of the cliffs to work on.〔(People & Events: Doane Robinson (1856-1946) )〕 Gutzon Borglum, having decided on the location of the sculpture, he decided to make this monument of four Presidents of the United States. He chose the two most famous Presidents in American history, George Washington and Abraham Lincoln. He chose Thomas Jefferson because Jefferson nearly doubled the size of the United States in the 1803 Louisiana Purchase (which included the land that became South Dakota). The last President Borglum chose was Theodore Roosevelt, suggested by President Calvin Coolidge (who insisted that at least there be two Republicans and at least one Democrat represented.〔Fite, Gilbert C. ''Mount Rushmore'' (May 2003). ISBN 0-9646798-5-X.〕) because of Theodore Roosevelt's introduction of the National Park Service. Borglum's original design was a sculpture of each president intended to go down to their waists, but time constraints and funding only provided for their heads.〔(Rushmore )〕 Ivan Houser, father of John Sherrill Houser, was assistant sculptor to Gutzon Borglum during the early years of carving; he began working with Borglum shortly after the inception of the monument and was with Borglum for a total of seven years. When Houser left Gutzon to devote his talents to his own work, Borglum's son, Lincoln, became assistant sculptor. ==Construction== A few hundred workers, who were usually miners, sculptors, or rock climbers, used dynamite, jackhammering, and chiseling to sculpt the model from the mountain. A stairway was constructed to the top of the mountain first and ropes fixed. Workers were supported by harnesses attached to the ropes. The irises of the eyes were sculpted as holes. A cube of granite was left in each to represent the reflection highlight thereby making the appearance of the eyes more realistic. Construction began on October 4, 1927. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Construction of Mount Rushmore」の詳細全文を読む スポンサード リンク
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