President Grant approved an act on August 02 , 1876 providing the Federal government to complete the construction . The new Maryland marble was obtained from the same vein as the original stone used for the lower part , but since it came from a different stratum a ring is noticeable on the shaft . On August 09 , 1884 the walls of the memorial reached 500 feet . According to Binczewski the for aluminum cap was placed by Colonel Thomas Lincoln Casey , the engineer incharge...











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