The Development of the Art of Radio Receiving from the Early 1920's to the Present

A brief résumé of important scientific discoveries leading to radio broadcasting is given. There follows a discussion of the most important types of home broadcast radio-receiving circuits which came into use after the advent of entertainment broadcasting. These circuits include crystal receivers, regenerative receivers, neutrodynes and superheterodynes. Attention is also given to the development of automatic volume control, automobile radios and FM receivers. An effort has been made to present the developments chronologically with attention primarily being given to the work of leading pioneers. In the final part of the paper some of the more important innovations in the radio-receiving art are mentioned and, in some cases, briefly discussed.