Simple AM Radio Receiver - c. 1920
Schematic Components (L to R):
Antenna, Variable Inductor (tuning) & Ground, Detector, Magnetic Headset.

Old Technology
Who remembers without a doubt,
What wireless radio was all about?
AM, FM, I can't forget:
Oscillating detector, superhet, Cat-whisker spring and crystal set.
Under the blankets late at night
Hiding the glow from a dial light.
Probing secrets near and far,
That funny noise might be a star.
Programming long ago,
Big John and Sparkie from Chicago.
Western heroes on big broncos,
Mysteries only the shadow knows.
The irony of technology is bittersweet,
A cycle oft to repeat,
Marconi's marvel now obsolete.