Letters of a Radio-Engineer to His Son

In a warm, conversational tone a seasoned radio engineer writes to his curious son, laying out the basics of electricity and matter as the foundation for radio‑telephony. He explains electrons and protons with vivid analogies, demystifies atoms, and shows how copper wire, glass plates, and simple batteries become the heart of a working set. The letters are designed to be read, re‑read, and taken apart piece by piece, so even a complete beginner can follow the rapid advances of early twentieth‑century radio.

Beyond theory, the writer invites his son to experiment, offering step‑by‑step sketches for constructing a tiny receiver that can pick up real broadcasts. Those hands‑on projects capture the excitement of early hobbyists, letting listeners imagine the crackle of distant stations as they tune a coil of wire. The letters keep the technical detail clear yet lively, making the history of radio feel like a personal adventure for anyone eager to understand how invisible currents become sound.