Illustrated with black and white photos and graphs, "Modern Radio Essentials" offers a general discussion of radio technology directed "to those elements of electricity that are related directly to the operation of devices designed to receive, amplify, detect and reproduce radio signals." Everything from acoustics, to magnetism and electricity, resistance, capacitance, inductance, direct and alternating current, vacuum tubes, oscillatory circuits, amplification, source of radio signals, receiving circuits, reproducing devices, antennas, power supply and more!