From Hertz discovery of how to produce electric waves, through Marconi and Fessenden, this is first an historical record of the steps of development of radio and electronics, and then a how-to book for those aspiring to build their own. The ABC's of electricity, radio waves, electrons and electronics, radio tubes, feedback and regeneration, this is essential foundation material for the youthful radio builder. Morgan then goes on to discussion of the parts and materials involved in building one's own apparatus, and in successive final chapters, he discusses, step by step, the procedure of building. He takes first the simplest type of receiver sets; then one-tube regenerative receivers. He goes on to building an amplifier, to antenna and ground. And he ends with instructions on how to send and receive. The diagrams and charts are excellent. One could wish he would dispense with the human figures. The market is self-evident.