A diaphragmless microphone for radio broadcasting

THE broadcasting of regular programs of entertainment and instruction was begun in the Fall of 1920. It was not long before the service became quite generally used, although at first this was due to its novelty. Judged by present standards, the character of the programs rendered, and the quality of modulation attained, was susceptible to great improvement; and the development of better apparatus and methods of modulation has gone hand in hand with the broadening of the scope of entertainment offered.