Waves can also be separated into transverse and longitudinal waves. In a transverse wave, the motion of the particles of the medium is at right angles (i.e., transverse) to the direction the wave moves.
The experiment's name comes from the Tuskegee Institute, the black university founded by Booker T. Washington. Its affiliated hospital lent the PHS its medical facilities for the study, and other predominantly black institutions as well as local black doctors also participated.
In 1965 Tuskegee University was declared a National Historic Landmark for the significance of its academic programs, its role in higher education for African-Americans, and its status in United States history. Congress authorized the establishment of the Tuskegee Institute National Historic Site.