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Blasting Rock on Mount Rushmore, 1930s

Over 90% of Mount Rushmore was carved using dynamite. Dynamite blasts removed approximately 450,000 tons of rock from the mountain. Dynamite was used until only three to six inches of rock was left to remove to get to the final carving surface. At this point, the drillers and assistant carvers would drill holes into the granite very close together. This was called honeycombing. The closely drilled holes would weaken the granite so it could be removed often by hand. This historic photo is of early construction work on the Lincoln sculpture, showing dust from the dynamite blasts. Lincoln's head was the most challenging because of his beard, but his head was completed on the far right of the cliff. Mount Rushmore National Memorial is a sculpture carved into the granite face of Mount Rushmore near Keystone, South Dakota, featuring 60-foot sculptures of the heads of four U.S. presidents: George Washington, Thomas Jefferson, Theodore Roosevelt, and Abraham Lincoln. Construction on the memorial began in 1927, and the presidents' faces were completed between 1934 and 1939. Mount Rushmore has become an iconic symbol of the United States, and attracts over three million visitors annually. Photographed by Charles D'Emery, undated.
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Titre:
Blasting Rock on Mount Rushmore, 1930s
Légende: Voir la traduction automatique
Over 90% of Mount Rushmore was carved using dynamite. Dynamite blasts removed approximately 450,000 tons of rock from the mountain. Dynamite was used until only three to six inches of rock was left to remove to get to the final carving surface. At this point, the drillers and assistant carvers would drill holes into the granite very close together. This was called honeycombing. The closely drilled holes would weaken the granite so it could be removed often by hand. This historic photo is of early construction work on the Lincoln sculpture, showing dust from the dynamite blasts. Lincoln's head was the most challenging because of his beard, but his head was completed on the far right of the cliff. Mount Rushmore National Memorial is a sculpture carved into the granite face of Mount Rushmore near Keystone, South Dakota, featuring 60-foot sculptures of the heads of four U.S. presidents: George Washington, Thomas Jefferson, Theodore Roosevelt, and Abraham Lincoln. Construction on the memorial began in 1927, and the presidents' faces were completed between 1934 and 1939. Mount Rushmore has become an iconic symbol of the United States, and attracts over three million visitors annually. Photographed by Charles D'Emery, undated.
Crédit:
Album / Science Source / National Park Service/Charles D'Emery
Autorisations:
? Autorisation de modèle: Non - ? Autorisation de propriété: Non
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Taille de l'image:
4200 x 3268 px | 39.3 MB
Taille d'impression:
35.6 x 27.7 cm | 14.0 x 10.9 in (300 dpi)
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