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.
Tuskegee University, established in 1881 in Tuskegee, Macon County, is the second-oldest historically black college in Alabama. Many of its faculty and staff made significant contributions to agriculture and rural life, and the school served as the training ground for the Tuskegee Airmen of World War II fame.