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The Mount Rushmore National Memorial is one of the world's largest sculptural and engineering projects. Sculptor-designer John Gutzon de la Mothe Borglum (1867–1941) was contracted in 1927 to carve the solid-granite memorial. Borglum conceived the model figures, brought them to life within the mountain's stone, and directed 400 artisans until his death in 1941. Later that year, his son Lincoln finished the project, which had spanned 14 years (6.5 years of actual carving and 8.5 years of delays due to lack of money and bad weather) at a cost of $1 million.
Mount Rushmore is considered a priceless U.S. treasure, memorializing the first 150 years of the country's struggle for independence and the birth of the republic as represented by George Washington; the idea of representative government in an expanding nation as envisioned by Thomas Jefferson; the preservation of the union of states and the equality for all citizens as championed by Abraham Lincoln; and the twentieth-century developmental role of the United States in world affairs and economy as promoted by Theodore Roosevelt.
Mount Rushmore would not have been possible without Borglum's earlier carving experience of Confederate leaders on Stone Mountain. In the Rushmore project, Borglum employed few conventional sculpturing methods
in what was a unique engineering accomplishment. Borglum knew that he needed a cliff 400- to 500-feet in height; it had to lay at an angle so the main wall would face toward the sun; and there had to be sufficient amounts of even, unblemished stone to provide an acre of upright surface.
The presidential models were based on descriptions, paintings, photographs, life masks, and Borglum's interpretations. Initially, Borglum climbed down the mountain to locate Washington's nose line, eyebrows, and chin, marking each with red paint. From these points, he studied and mathematically calculated the scale necessary for the first head. Realizing the importance of models at the worksite, Borglum displayed a five-foot mask of each figure as a guide for the workers. However, Borglum did not simply transpose the models directly onto the granite; rather he fine-tuned the heads into artwork. In fact, Borglum realized that to transfer accurately his models into finished heads, he needed mathematical and engineering concepts. What he had to be, besides a sculptor, was an explosives expert, a geologist, a miner, an engineer, and a mathematician.
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