Hugh Aitken describes a critical period in the history of radio, when continuous wave technology first made reliable long-distance wireless communication possible and opened up opportunities for broadcasting voice and music. Originally published in 1985. ThePrinceton Legacy Libraryuses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These paperback editions preserve the original texts of these important books while presenting them in durable paperback editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.